In my environment,Remote Server MS SQL Server resource not found on backup exec 2014 manager console ,I tried to reinstall and add the license,But it didn't work.This SQL Server use AlwaysOn(Availability Group),But I added the local server node.Thank you for your help
You might want to check if your SQL version is actually supported with Backup Exec 2014:
In addition if you look at "Whats new in Backup Exec":
You will see that under Backup Exec 21.1; the first point is SQL Availability Group.
Can you share a screenshot of the selection when you browse the nodes (preferable so we can see the selection list available of both nodes).