Chad Callihan gets things moving after a few 1s without enough 0s clog up the pipe:
Keeping an Always On Availability Group healthy is crucial, and seeing a non-synchronizing database in an Always On High Availability Group can give you a sinking feeling (pardon the pun). Disregarding the reason for the syncing issue, there are a few ways to resume syncing and get your setup back in the green.
Let’s look at resuming using the SSMS GUI and running a SQL statement.
Read on for the process. I appreciate that Chad also includes the T-SQL operation to do this.