The availability replica for availability group '%1!s!' on this instance of SQL Server cannot become the primary replica. ...

The availability replica for availability group '%1!s!' on this instance of SQL Server cannot become the primary replica. One or more databases are not synchronized or have not joined the availability group, or the WSFC cluster was started in Force Quorum mode. If the cluster was started in Force Quorum mode or the availability replica uses the asynchronous-commit mode, consider performing a forced manual failover (with possible data loss). Otherwise, once all local secondary databases are joined and synchronized, you can perform a planned manual failover to this secondary replica (without data loss). For more information, see SQL Server Books Online.