Sean Gallardy talks about an error:
Contained Availability Groups are the most recent update to the Availability Groups feature, and a great update at that! They are completely new in SQL Server 2022, and like any new feature (or even mature ones) there will be some bugs. Enter in some Access Violations (AVs) that may occur when creating a new contained availability group.
Read on for an example of the error and what you can do until Microsoft fixes it.