sqlcmd -S instance
1> sp_password NULL, 111, 'sa'
Msg 15151, Level 16, State 1, Server, Line 1
Cannot alter the login 'sa', because it does not exist or you do not have permission.

1> ALTER SERVER ROLE sysadmin ADD MEMBER [domen\login]
Msg 15151, Level 16, State 1, Server , Line 1
Cannot alter the server role 'sysadmin', because it does not exist or you do not have permission.