Grant all the privileges to user in SQL Server

Question

I'm working on SQL Server. I created a new login, new user to the database then I log into the instance with sql server authentification using the same login. I gave the user all the privileges by checking these

I've run the command:

grant all to [user]

and got this error

Cannot grant, deny or revoke permissions to sa, dbo, entity owner, information_schema, sys or yourself.

and then still can't save changes and update tables because it's not permitted. how can I grant all the privileges the the user?

Thanks in advance.

Answer 1

Grant permissions using SA user because you can not give restricted permissions to yourself if you don't have permission to do it.