The database principal owns a message type in the database and cannot be dropped

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When dropping a user from a database, sometimes they own a table or a schema, and you can go drop them

select dp.name, smt.*
from sys.service_message_types smt
inner join sys.database_principals dp on smt.principal_id = dp.principal_id


ALTER AUTHORIZATION ON MESSAGE TYPE::Name TO dbo;

To find the owners of service types, run the following T-SQL:

select dp.name, smt.*
from sys.service_message_types smt
inner join sys.database_principals dp on smt.principal_id = dp.principal_id

To change the owner to dbo, run the following:
ALTER AUTHORIZATION ON MESSAGE TYPE::Name TO dbo;

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