Hi anonymous user
Per my research, after the Cumulative Update 4 for Workflow Manager 1.0, SQL Always on is supported.
For FBA databases, as long as the database is an online read-write database that exists on the server instance hosting the primary replica, it can be added to the availability group
For more information, you could refer to:
https://learn.microsoft.com/en-us/sql/database-engine/availability-groups/windows/overview-of-always-on-availability-groups-sql-server?view=sql-server-ver15
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