Joining Availability Groups

Chris Lumnah troubleshoots an error in automatic seeding of an Availability Group:

In my lab, I decided to play around with the automatic seeding functionality that is part of Availability Groups. This was sparked by my last post about putting SSISDB into an AG. I wanted to see how it would work for a regular database. When I attempted to do so, I received the following error:

Cannot alter the availability group ‘Group1’, because it does not exist or you do not have permission. (Microsoft SQL Server, Error: 15151)

Read on for the answer; it turns out automatic seeding itself was not the culprit.

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