Cannot use the special principal 'sa'

Question

When I try to run the command:

EXEC master..sp_addsrvrolemember @loginame = N\'sa\', @rolename = N\'serveradmin\'
GO

I get the error:

Answer 1

'sa' is a reserved login for the sysadmin; it's already a member of the sysadmin group, which trumps all other groups. You don't need to add it to any roles, so why are you trying to do that?