Support for User Identity with HybridConnectionListener

[lor1mp]

I'm trying to use an Azure Relay to do some local web service testing. This is using a modified HybridConnectionReverseProxy from the examples. The modification is to use some of the Azure.Identity features (similar to ManagedIdentity) as a TokenProvider. I have a wrapper that will use any TokenCredential, such as DefaultAzureCredential. It's effectively the same implementation as the ManagedIdentityTokenProvider. I can successfully retrieve a token, but the listener.OpenAsync call gets an exception WebSocketException: The server returned status code '500' when status code '101' was expected..

It seems like this type of token isn't supported. We're trying to move away from secrets, so support for this would be very helpful.