[BUG] Empy principalId and/or tenandId in identity section of GenericResource causes null error exception

[lukerogers]

Library name and version

Azure.ResourceManager 1.3.1

Describe the bug

When loading a generic resource, some of them return an "identity" section with the following payload:

"identity": {
    "principalId": "",
    "tenantId": "",
    "type": "None"
}

It throws a null error for both principalId and tenantId.

Expected behavior

The resource is able to be loaded correctly

Actual behavior

SystemFormatException: One of the identified items was in an invalid format.

The exception is thrown in https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/resourcemanager/Azure.ResourceManager/src/Common/Custom/Models/ManagedServiceIdentity.Serialization.cs on lines 58 and 68.

So far I've come across this on 2 resources, and here are their payloads with extra stuff removed:

{
    "value": [
        {
            "id": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.DevTestLab/labs/{labName}",
            "name": "{labName}",
            "type": "Microsoft.DevTestLab/labs",
            "location": "eastus2",
            "identity": {
                "principalId": "",
                "tenantId": "",
                "type": "None"
            }
        }
    ]
},
{
    "value": [
        {
            "id": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.CognitiveServices/accounts/{name}",
            "name": "{name}",
            "type": "Microsoft.CognitiveServices/accounts",
            "sku": {
                "name": "S1"
            },
            "kind": "TextTranslation",
            "location": "northeurope",
            "identity": {
                "principalId": "",
                "tenantId": "",
                "type": "None"
            }
        }
    ]
}

Reproduction Steps

I included the payload I am receiving from the Azure REST API. I don't know if something needs to change with the model, annotations, or something else to make this work correctly.

I did open #31633 for the same issue in the PolicyInsights library. I'm guessing they are related and have the same fix.

Environment

I'm running this on Windows 11 with .NET version 6.0.9 and Visual Studio 2022

[azure-sdk]

Label prediction was below confidence level 0.6 for Model:ServiceLabels: 'Service Bus:0.10836075,Azure.Identity:0.08485829,ARM:0.07226999'

[jsquire]

Thank you for your feedback. Tagging and routing to the team member best able to assist.

[Yao725]

Thanks for reaching out to us, created this issue to track the progress and we will discuss how to handle this case.