[BUG] Required property 'type' not found in JSON. Path 'properties.deadLetterWithResourceIdentity.identity' about azure-sdk-for-net

[ArcturusZhang]

Hi @brennfoster thanks for reporting this.

As far as I could see, if the issue complaining that there should be a type property in properties.deadLetterWithResourceIdentity.identity, taking a look at the class EventSubscriptionIdentity:

azure-sdk-for-net/sdk/eventgrid/Azure.ResourceManager.EventGrid/src/Generated/Models/EventSubscriptionIdentity.cs

Line 65 in c508cf0

public EventSubscriptionIdentityType? IdentityType { get; set; }

The IdentityType property (which serializes into type in the Json) is settable, and you need to set it according to the error message.

[github-actions]

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[brennfoster]

I set the IdentityType and it is working now, but I don't understand why it all the sudden needed that to be set? It has worked fine without setting that for quite a while now. What changed? There are no version upgrades for the nuget package we are referencing. It's nullable so it seems like it is expecting not to be set.