Issue with protobuf types in schema registration .NET producer

Hi team,

I am using a .Net producer to push protobuf messages to kafka topic. The protobuf contains special types like google/protobuf/timestamp.proto. The schema is registered. I am getting the following error message:
User is denied operation Write on Subject: google/protobuf/timestamp.proto; error code: 40301
I was not able to find anything about this kind of error. Can you give me some more details about this kind of error. It’s looks like we only have this issue with .Net producer.