Hi @Crain, Brett ,
Create any database is a proprietary Microsoft SQL Server permission, it is not associated with a user so it does not appear in sys.server_permissions.
You can check out this doc:
Use automatic seeding to initialize a secondary replica for an Always On availability group
If the availability group has not granted the correct permissions, you will see the error message in the SQL Server log of the secondary replica, if you want to verify that the automatic seeding is configured successfully, it also can be seen in the SQL Server log, and the DMV:
sys.dm_hadr_automatic_seeding
and sys.dm_hadr_physical_seeding_stats.
to monitor seeding
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