SQL Server2012 AlwaysOn Connection to the primary replica that cannot join the database to the availability group is not active

when configuring an AlwaysOn availability group, you encounter the following error, where Server 86 is the replica database server.

To resolve this problem, simply change the SQL service's running account to the administrator and open the 5022 port in the firewall (the port number can be found on the properties page in the availability group).

SQL Server2012 AlwaysOn Connection to the primary replica that cannot join the database to the availability group is not active