The automatic sync from my syncgroups stopped in SQL Azure DB.
Running the health check script provided by Azure one of the warnings mentioned that ##MS_SyncAccount## is missing.
I tried to create it as below...
CREATE USER [##MS_SyncAccount##]
GO
but I got the error message below
'##MS_SyncAccount##' is not a valid login or you do not have permission.
The question here is how to create the '##MS_SyncAccount##' account?
I tried with your code I got the same error.
CREATE USER [##MS_SyncAccount##]
GO
Here is the reference image for error I got:
I tried this code and it is working for me.
CREATE USER [##MS_SyncAccount##]
WITHOUT LOGIN
GO
Here is the reference image for the same.
Reference below image to create the USER.