Get-AzSecurityContact: Unable to deserialize the response.

[jainankurp1]

Description

Getting below message when running Get-AzSecurityContact for a subscription from cloud shell
Get-AzSecurityContact: Unable to deserialize the response.

Issue script & Debug output

Get-AzSecurityContact

Environment data

Name                           Value
----                           -----
PSVersion                      7.5.0
PSEdition                      Core
GitCommitId                    7.5.0
OS                             Microsoft Azure Linux 3.0
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Module versions

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Script     0.11.1                Az.Subscription                     Core,Desk {Disable-AzSubscription, Enable-AzSubscription, Get-AzSubscription…

    Directory: /usr/local/share/powershell/Modules

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Script     13.4.0                Az                                  Core,Desk 
Script     4.1.0                 Az.Accounts                         Core,Desk {Disable-AzDataCollection, Disable-AzContextAutosave, Enable-AzDat…
Script     2.1.0                 Az.Advisor                          Core,Desk {Disable-AzAdvisorRecommendation, Enable-AzAdvisorRecommendation, …
Script     6.1.1                 Az.Aks                              Core,Desk {Disable-AzAksAddOn, Enable-AzAksAddOn, Get-AzAksCluster, Get-AzAk…
Script     1.2.0                 Az.AnalysisServices                 Core,Desk {Add-AzAnalysisServicesAccount, Export-AzAnalysisServicesInstanceL…
Script     4.1.0                 Az.ApiManagement                    Core,Desk {Add-AzApiManagementApiToGateway, Add-AzApiManagementApiToProduct,…
Script     2.0.1                 Az.App                              Core,Desk {Disable-AzContainerAppRevision, Enable-AzContainerAppRevision, Ge…
Script     1.4.1                 Az.AppConfiguration                 Core,Desk {Clear-AzAppConfigurationDeletedStore, Get-AzAppConfigurationDelet…
Script     2.3.0                 Az.ApplicationInsights              Core,Desk {Get-AzApplicationInsights, Get-AzApplicationInsightsApiKey, Get-A…
Script     1.1.0                 Az.ArcResourceBridge                Core,Desk {Get-AzArcResourceBridge, Get-AzArcResourceBridgeApplianceCredenti…
Script     2.1.0                 Az.Attestation                      Core,Desk {Add-AzAttestationPolicySigner, Get-AzAttestationPolicy, Get-AzAtt…
Script     1.1.0                 Az.Automanage                       Core,Desk {Get-AzAutomanageBestPractice, Get-AzAutomanageConfigProfile, Get-…
Script     1.11.1                Az.Automation                       Core,Desk {Export-AzAutomationDscConfiguration, Export-AzAutomationDscNodeRe…
Script     3.7.0                 Az.Batch                            Core,Desk {Disable-AzBatchAutoScale, Disable-AzBatchComputeNodeScheduling, D…
Script     2.2.0                 Az.Billing                          Core,Desk {Get-AzBillingAccount, Get-AzBillingInvoice, Get-AzBillingPeriod, …
Script     3.3.1                 Az.Cdn                              Core,Desk {Clear-AzCdnEndpointContent, Clear-AzFrontDoorCdnEndpointContent, …
Script     2.1.0                 Az.CloudService                     Core,Desk {Get-AzCloudService, Get-AzCloudServiceInstanceView, Get-AzCloudSe…
Script     1.16.0                Az.CognitiveServices                Core,Desk {Add-AzCognitiveServicesAccountNetworkRule, Get-AzCognitiveService…
Script     9.2.0                 Az.Compute                          Core,Desk {Add-AzImageDataDisk, Add-AzVhd, Add-AzVMAdditionalUnattendContent…
Script     1.1.0                 Az.ConfidentialLedger               Core,Desk {Get-AzConfidentialLedger, New-AzConfidentialLedger, New-AzConfide…
Script     1.1.1                 Az.ConnectedMachine                 Core,Desk {Connect-AzConnectedMachine, Get-AzConnectedExtensionMetadata, Get…
Script     4.1.1                 Az.ContainerInstance                Core,Desk {Add-AzContainerInstanceOutput, Get-AzContainerGroup, Get-AzContai…
Script     4.3.0                 Az.ContainerRegistry                Core,Desk {Connect-AzContainerRegistry, Get-AzContainerRegistryManifest, Get…
Script     1.18.0                Az.CosmosDB                         Core,Desk {Get-AzCosmosDBAccount, Get-AzCosmosDBAccountKey, Get-AzCosmosDBCa…
Script     1.2.1                 Az.DataBoxEdge                      Core,Desk {Get-AzDataBoxEdgeBandwidthSchedule, Get-AzDataBoxEdgeDevice, Get-…
Script     1.10.0                Az.Databricks                       Core,Desk {Get-AzDatabricksAccessConnector, Get-AzDatabricksOutboundNetworkD…
Script     1.19.1                Az.DataFactory                      Core,Desk {Add-AzDataFactoryV2DataFlowDebugSessionPackage, Add-AzDataFactory…
Script     1.1.0                 Az.DataLakeAnalytics                Core,Desk {Add-AzDataLakeAnalyticsDataSource, Add-AzDataLakeAnalyticsFirewal…
Script     1.4.0                 Az.DataLakeStore                    Core,Desk {Add-AzDataLakeStoreFirewallRule, Add-AzDataLakeStoreItemContent, …
Script     2.6.1                 Az.DataProtection                   Core,Desk {Backup-AzDataProtectionBackupInstanceAdhoc, Edit-AzDataProtection…
Script     1.1.1                 Az.DataShare                        Core,Desk {Get-AzDataShare, Get-AzDataShareAccount, Get-AzDataShareDataSet, …
Script     5.4.1                 Az.DesktopVirtualization            Core,Desk {Disconnect-AzWvdUserSession, Expand-AzWvdMsixImage, Get-AzWvdAppA…
Script     2.0.1                 Az.DevCenter                        Core,Desk {Connect-AzDevCenterAdminCatalog, Connect-AzDevCenterAdminProjectC…
Script     1.1.0                 Az.DevTestLabs                      Core,Desk {Get-AzDtlAllowedVMSizesPolicy, Get-AzDtlAutoShutdownPolicy, Get-A…
Script     1.3.1                 Az.Dns                              Core,Desk {Add-AzDnsRecordConfig, Get-AzDnsRecordSet, Get-AzDnsZone, New-AzD…
Script     1.1.1                 Az.DnsResolver                      Core,Desk {Get-AzDnsForwardingRuleset, Get-AzDnsForwardingRulesetForwardingR…
Script     1.2.1                 Az.ElasticSan                       Core,Desk {Add-AzElasticSanVolumeGroupNetworkRule, Get-AzElasticSan, Get-AzE…
Script     2.2.0                 Az.EventGrid                        Core,Desk {Disable-AzEventGridPartnerTopic, Enable-AzEventGridPartnerDestina…
Script     5.2.0                 Az.EventHub                         Core,Desk {New-AzEventHubAuthorizationRuleSASToken, Approve-AzEventHubPrivat…
Script     1.12.0                Az.FrontDoor                        Core,Desk {Disable-AzFrontDoorCustomDomainHttps, Enable-AzFrontDoorCustomDom…
Script     4.2.0                 Az.Functions                        Core,Desk {Get-AzFunctionApp, Get-AzFunctionAppAvailableLocation, Get-AzFunc…
Script     6.3.1                 Az.HDInsight                        Core,Desk {Add-AzHDInsightClusterIdentity, Add-AzHDInsightComponentVersion, …
Script     2.1.0                 Az.HealthcareApis                   Core,Desk {Get-AzHealthcareApisService, Get-AzHealthcareApisWorkspace, Get-A…
Script     1.0.0                 Az.HealthDataAIServices             Core,Desk {Get-AzDeidService, New-AzDeidService, Remove-AzDeidService, Updat…
Script     2.8.0                 Az.IotHub                           Core,Desk {Add-AzIotHubCertificate, Add-AzIotHubConfiguration, Add-AzIotHubD…
Script     6.3.1                 Az.KeyVault                         Core,Desk {Add-AzKeyVaultCertificate, Add-AzKeyVaultCertificateContact, Add-…
Script     2.4.0                 Az.Kusto                            Core,Desk {Add-AzKustoClusterCalloutPolicy, Add-AzKustoClusterLanguageExtens…
Script     1.1.0                 Az.LoadTesting                      Core,Desk {Get-AzLoad, New-AzLoad, Remove-AzLoad, Update-AzLoad}
Script     1.6.0                 Az.LogicApp                         Core,Desk {Get-AzIntegrationAccount, Get-AzIntegrationAccountAgreement, Get-…
Script     1.2.0                 Az.MachineLearning                  Core,Desk {Add-AzMlWebServiceRegionalProperty, Export-AzMlWebService, Get-Az…
Script     1.2.0                 Az.MachineLearningServices          Core,Desk {Get-AzMLServiceQuota, Get-AzMLServiceUsage, Get-AzMLServiceVMSize…
Script     1.5.1                 Az.Maintenance                      Core,Desk {Get-AzApplyUpdate, Get-AzConfigurationAssignment, Get-AzMaintenan…
Script     1.3.1                 Az.ManagedServiceIdentity           Core,Desk {Get-AzFederatedIdentityCredential, Get-AzSystemAssignedIdentity, …
Script     3.1.0                 Az.ManagedServices                  Core,Desk {Get-AzManagedServicesAssignment, Get-AzManagedServicesDefinition,…
Script     2.1.0                 Az.MarketplaceOrdering              Core,Desk {Get-AzMarketplaceTerms, Invoke-AzMarketplaceSignTerms, Set-AzMark…
Script     1.2.0                 Az.Media                            Core,Desk {Get-AzMediaService, Get-AzMediaServiceKey, Get-AzMediaServiceName…
Script     2.7.0                 Az.Migrate                          Core,Desk {Get-AzMigrateDiscoveredServer, Get-AzMigrateJob, Get-AzMigrateLoc…
Script     6.0.2                 Az.Monitor                          Core,Desk {Add-AzLogProfile, Add-AzMetricAlertRule, Add-AzMetricAlertRuleV2,…
Script     1.3.0                 Az.MySql                            Core,Desk {Get-AzMySqlConfiguration, Get-AzMySqlConnectionString, Get-AzMySq…
Script     7.15.1                Az.Network                          Core,Desk {Add-AzApplicationGatewayAuthenticationCertificate, Add-AzApplicat…
Script     1.1.0                 Az.NetworkCloud                     Core,Desk {Deploy-AzNetworkCloudCluster, Disable-AzNetworkCloudStorageApplia…
Script     1.2.0                 Az.Nginx                            Core,Desk {Get-AzNginxCertificate, Get-AzNginxConfiguration, Get-AzNginxDepl…
Script     1.2.0                 Az.NotificationHubs                 Core,Desk {Get-AzNotificationHub, Get-AzNotificationHubAuthorizationRule, Ge…
Script     3.3.0                 Az.OperationalInsights              Core,Desk {Disable-AzOperationalInsightsIISLogCollection, Disable-AzOperatio…
Script     1.1.0                 Az.Oracle                           Core,Desk {Add-AzOracleCloudVMClusterVM, Get-AzOracleAutonomousDatabase, Get…
Script     1.7.1                 Az.PolicyInsights                   Core,Desk {Get-AzPolicyAttestation, Get-AzPolicyEvent, Get-AzPolicyMetadata,…
Script     1.2.0                 Az.PostgreSql                       Core,Desk {Get-AzPostgreSqlConfiguration, Get-AzPostgreSqlConnectionString, …
Script     2.1.0                 Az.PowerBIEmbedded                  Core,Desk {Get-AzPowerBIEmbeddedCapacity, New-AzPowerBIEmbeddedCapacity, Rem…
Script     1.2.0                 Az.PrivateDns                       Core,Desk {Add-AzPrivateDnsRecordConfig, Get-AzPrivateDnsRecordSet, Get-AzPr…
Script     7.6.0                 Az.RecoveryServices                 Core,Desk {Add-AzRecoveryServicesAsrReplicationProtectedItemDisk, Backup-AzR…
Script     1.11.0                Az.RedisCache                       Core,Desk {Export-AzRedisCache, Get-AzRedisCache, Get-AzRedisCacheFirewallRu…
Script     1.4.1                 Az.RedisEnterpriseCache             Core,Desk {Export-AzRedisEnterpriseCache, Get-AzRedisEnterpriseCache, Get-Az…
Script     2.1.0                 Az.Relay                            Core,Desk {Get-AzRelayAuthorizationRule, Get-AzRelayHybridConnection, Get-Az…
Script     1.2.0                 Az.ResourceGraph                    Core,Desk {Search-AzGraph, Get-AzResourceGraphQuery, New-AzResourceGraphQuer…
Script     1.3.0                 Az.ResourceMover                    Core,Desk {Add-AzResourceMoverMoveResource, Get-AzResourceMoverMoveCollectio…
Script     7.10.0                Az.Resources                        Core,Desk {Export-AzResourceGroup, Export-AzTemplateSpec, Get-AzDenyAssignme…
Script     1.8.0                 Az.Security                         Core,Desk {Add-AzSecurityAdaptiveNetworkHardening, Add-AzSecuritySqlVulnerab…
Script     3.2.0                 Az.SecurityInsights                 Core,Desk {Get-AzSentinelAlertRule, Get-AzSentinelAlertRuleAction, Get-AzSen…
Script     4.1.1                 Az.ServiceBus                       Core,Desk {New-AzServiceBusAuthorizationRuleSASToken, Test-AzServiceBusNameA…
Script     3.5.0                 Az.ServiceFabric                    Core,Desk {Add-AzServiceFabricClientCertificate, Add-AzServiceFabricManagedC…
Script     2.1.0                 Az.SignalR                          Core,Desk {Get-AzSignalR, Get-AzSignalRKey, Get-AzSignalRUsage, New-AzSignal…
Script     6.0.2                 Az.Sql                              Core,Desk {Add-AzSqlDatabaseToFailoverGroup, Add-AzSqlElasticJobStep, Add-Az…
Script     2.4.0                 Az.SqlVirtualMachine                Core,Desk {Assert-AzSqlVMEntraAuth, Get-AzAvailabilityGroupListener, Get-AzS…
Script     2.5.0                 Az.StackHCI                         Core,Desk {Add-AzStackHCIVMAttestation, Disable-AzStackHCIAttestation, Disab…
Script     1.1.0                 Az.StackHCIVM                       Core,Desk {Add-AzStackHCIVMVirtualMachineDataDisk, Add-AzStackHCIVMVirtualMa…
Script     8.3.0                 Az.Storage                          Core,Desk {Add-AzRmStorageContainerLegalHold, Add-AzStorageAccountManagement…
Script     1.5.0                 Az.StorageMover                     Core,Desk {Get-AzStorageMover, Get-AzStorageMoverAgent, Get-AzStorageMoverEn…
Script     2.5.0                 Az.StorageSync                      Core,Desk {Get-AzStorageSyncCloudEndpoint, Get-AzStorageSyncGroup, Get-AzSto…
Script     2.1.0                 Az.StreamAnalytics                  Core,Desk {Get-AzStreamAnalyticsCluster, Get-AzStreamAnalyticsClusterStreami…
Script     2.1.0                 Az.Support                          Core,Desk {Get-AzSupportChatTranscript, Get-AzSupportChatTranscriptsNoSubscr…
Script     3.2.0                 Az.Synapse                          Core,Desk {Add-AzSynapseDataFlowDebugSessionPackage, Add-AzSynapseTriggerSub…
Script     1.1.3                 Az.Tools.Predictor                  Core      {Enable-AzPredictor, Disable-AzPredictor, Open-AzPredictorSurvey, …
Script     1.3.0                 Az.TrafficManager                   Core,Desk {Add-AzTrafficManagerCustomHeaderToEndpoint, Add-AzTrafficManagerC…
Script     3.4.0                 Az.Websites                         Core,Desk {Add-AzWebAppAccessRestrictionRule, Add-AzWebAppTrafficRouting, Ed…
Script     1.0.0                 Az.Workloads                        Core,Desk {Get-AzWorkloadsMonitor, Get-AzWorkloadsProviderInstance, Get-AzWo…
Script     0.0.0.10              AzureAD.Standard.Preview            Desk      {Get-AzureADDirectoryRoleTemplate, Get-AzureADContact, Remove-Azur…
Script     0.9.3                 AzurePSDrive                        Desk      
Script     3.7.2                 ExchangeOnlineManagement            Desk      {Add-VivaModuleFeaturePolicy, Add-VivaOrgInsightsDelegatedRole, Ge…
Script     4.7.0                 GuestConfiguration                  Desk      {New-GuestConfigurationPackage, Get-GuestConfigurationPackageCompl…
Script     2.26.1                Microsoft.Graph.Applications        Core,Desk {Add-MgApplicationKey, Add-MgApplicationPassword, Add-MgServicePri…
Script     2.26.1                Microsoft.Graph.Authentication      Core,Desk {Connect-MgGraph, Disconnect-MgGraph, Get-MgContext, Invoke-MgGrap…
Script     2.26.1                Microsoft.Graph.Groups              Core,Desk {Add-MgGroupFavorite, Add-MgGroupToLifecyclePolicy, Confirm-MgGrou…
Script     2.26.1                Microsoft.Graph.Identity.Directory… Core,Desk {Confirm-MgContactMemberGroup, Confirm-MgContactMemberObject, Conf…
Script     2.26.1                Microsoft.Graph.Identity.Governance Core,Desk {Add-MgIdentityGovernanceAccessReviewDefinitionInstanceDecision, G…
Script     2.26.1                Microsoft.Graph.Identity.SignIns    Core,Desk {Confirm-MgRiskyServicePrincipalCompromised, Confirm-MgRiskyUserCo…
Script     2.26.1                Microsoft.Graph.Users.Actions       Core,Desk {Confirm-MgUserMemberGroup, Confirm-MgUserMemberObject, Export-MgU…
Script     2.26.1                Microsoft.Graph.Users.Functions     Core,Desk {Export-MgUserDeviceAndAppManagementData, Get-MgUserDelta, Get-MgU…
Binary     1.1.2                 Microsoft.PowerShell.SecretManagem… Core      {Register-SecretVault, Unregister-SecretVault, Get-SecretVault, Se…
Binary     1.0.6                 Microsoft.PowerShell.SecretStore    Core      {Unlock-SecretStore, Set-SecretStorePassword, Get-SecretStoreConfi…
Manifest   1.2.1111              MicrosoftPowerBIMgmt                Desk      
Binary     1.2.1111              MicrosoftPowerBIMgmt.Admin          Desk      {Add-PowerBIEncryptionKey, Get-PowerBIEncryptionKey, Get-PowerBIWo…
Binary     1.2.1111              MicrosoftPowerBIMgmt.Capacities     Desk      Get-PowerBICapacity
Binary     1.2.1111              MicrosoftPowerBIMgmt.Data           Desk      {Add-PowerBIDataset, Set-PowerBITable, New-PowerBIDataset, New-Pow…
Binary     1.2.1111              MicrosoftPowerBIMgmt.Profile        Desk      {Connect-PowerBIServiceAccount, Disconnect-PowerBIServiceAccount, …
Binary     1.2.1111              MicrosoftPowerBIMgmt.Reports        Desk      {Get-PowerBIReport, New-PowerBIReport, Export-PowerBIReport, Get-P…
Binary     1.2.1111              MicrosoftPowerBIMgmt.Workspaces     Desk      {Get-PowerBIWorkspace, Get-PowerBIWorkspaceMigrationStatus, Add-Po…
Script     6.9.0                 MicrosoftTeams                      Core,Desk {Add-TeamChannelUser, Add-TeamUser, Connect-MicrosoftTeams, Discon…
Script     0.9.3                 PSCloudShellUtility                 Desk      {Get-AzCommand, Invoke-AzVMCommand, Enable-AzVMPSRemoting, Disable…
Script     2.3.6                 PSReadLine                          Desk      {Get-PSReadLineKeyHandler, Set-PSReadLineKeyHandler, Remove-PSRead…
Binary     0.8.1                 SHiPS                               Desk      
Script     22.3.0                SqlServer                           Core,Desk {Add-RoleMember, Add-SqlAvailabilityDatabase, Add-SqlAvailabilityG…

    Directory: /opt/microsoft/powershell/7/Modules

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Manifest   1.2.5                 Microsoft.PowerShell.Archive        Desk      {Compress-Archive, Expand-Archive}
Manifest   7.0.0.0               Microsoft.PowerShell.Host           Core      {Start-Transcript, Stop-Transcript}
Manifest   7.0.0.0               Microsoft.PowerShell.Management     Core      {Add-Content, Clear-Content, Clear-ItemProperty, Join-Path…}
Binary     1.1.0                 Microsoft.PowerShell.PSResourceGet  Core,Desk {Compress-PSResource, Find-PSResource, Get-InstalledPSResource, Ge…
Manifest   7.0.0.0               Microsoft.PowerShell.Security       Core      {Get-Credential, Get-ExecutionPolicy, Set-ExecutionPolicy, Convert…
Manifest   7.0.0.0               Microsoft.PowerShell.Utility        Core      {Export-Alias, Get-Alias, Import-Alias, New-Alias…}
Script     1.4.8.1               PackageManagement                   Desk      {Find-Package, Get-Package, Get-PackageProvider, Get-PackageSource…
Script     2.2.5                 PowerShellGet                       Desk      {Find-Command, Find-DSCResource, Find-Module, Find-RoleCapability…}
Script     2.3.6                 PSReadLine                          Desk      {Get-PSReadLineKeyHandler, Set-PSReadLineKeyHandler, Remove-PSRead…
Binary     2.0.3                 ThreadJob                           Desk      Start-ThreadJob

Error output

Message        : Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 
                 'Microsoft.Azure.Management.Security.Models.Page`1[Microsoft.Azure.Management.Security.Models.SecurityContact]' because the type 
                 requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.
                 To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or 
                 a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. 
                 JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.
                 Path '', line 1, position 1.
StackTrace     :    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract 
                 contract, JsonProperty member, Object existingValue, String id)
                    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, 
                 JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object 
                 existingValue)
                    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean 
                 checkAdditionalContent)
                    at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
                    at Microsoft.Rest.Serialization.SafeJsonConvert.DeserializeObject[T](String json, JsonSerializerSettings settings)
                    at Microsoft.Azure.Management.Security.SecurityContactsOperations.ListWithHttpMessagesAsync(Dictionary`2 customHeaders, 
                 CancellationToken cancellationToken)
Exception      : Newtonsoft.Json.JsonSerializationException
InvocationInfo : {Get-AzSecurityContact}
Line           : Get-AzSecurityContact
Position       : At line:1 char:1
                 + Get-AzSecurityContact
                 + ~~~~~~~~~~~~~~~~~~~~~
HistoryId      : 3

[github-actions]

Here are some similar issues that might help you. Please check if they can solve your problem.

• Get-AzSecurityContact gives Unable to deserialize the response error #23499

---

Possible solution (Extracted from existing issue, might be incorrect; please verify carefully)

Solution 1:

We eventually implemented the following workaround:

# Temporary solution due to a bug in az.security 1.5.0 with the command Get-AzSecurityContact.
$azContext = Get-AzContext
$token = Get-AzAccessToken -TenantId $azContext.Subscription.TenantId
$authHeader = @{
    'Content-Type'  = 'application/json'
    'Authorization' = 'Bearer ' + $token.Token
}
$restUri = "https://management.azure.com/subscriptions/$($azContext.Subscription.Id)/providers/Microsoft.Security/securityContacts?api-version=2020-01-01-preview"
$response = Invoke-RestMethod -Uri $restUri -Method Get -Headers $authHeader
$response.properties.phone

Reference:

• Get-AzSecurityContact gives Unable to deserialize the response error #23499 (comment)
• Get-AzSecurityContact gives Unable to deserialize the response error #23499 (comment)

Solution 2:

An even easier workaround is using the Az built in Invoke-AzRestMethod:

Invoke-AzRestMethod -Method 'Get' -Path (
  '/subscriptions/{0}/providers/Microsoft.Security/securityContacts?api-version=2020-01-01-preview' -f $Subscription.'Id'
)

Reference:

• Get-AzSecurityContact gives Unable to deserialize the response error #23499 (comment)

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[jainankurp1]

I would appreciate if solution provided with powershell not using the rest API.

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @keren-shani.