- Opening a `MessagesStream` from the gRPC client **without** providing the `sessionID` in metadata results in gRPC invalid argument error.
- Opening a `MessagesStream` from the gRPC client **providing the `sessionID` in a wrong format** in metadata results in gRPC unauthenticated error.
- Opening a `MessagesStream` from the gRPC client **providing the unexistent** `sessionID` in metadata results in gRPC unauthenticated error.