I am working in a test situation and have already successfully created a distributed availability group with automatic seeding. I cannot figure out how to add another database to the distributed AG. I successfully added the new database to the primary AG, but the alter availability group statement does not seem to work on the distributed AG. I get the following error:

> 
> Msg 15151, Level 16, State 1, Line 28  
> 
>  Cannot alter the availability group 'xxxx', because it does not exist or you do not have permission
> 
> 
> 

Attempting to modify the permissions for my group login yields the same message, yet the group is under the sysadmin role. Surely there is a way to add a database after you create the distributed AG?