Seaquel
SQL Server error code

SQL Server error 8401

SQL Server raises error 8401 at severity 16, which marks a problem with the query or data that you can correct.

This message could not be delivered because the target user with ID %i in database ID %i does not have permission to receive from the queue '%.*ls'.
Msg8401
Severity16
Group8000–8999

Source: Database Engine events and errors