Unable to remove servers from Backup Exec

We recently upgraded Backup Exec to 2014 and have several servers appearing in the Backup and Restore tab that were associated with old jobs that no longer exist, and therefore I'd like to remove these servers from the list. When I try removing them I get the following error:

"The server was unable to complete the requested operation. The server, <server name>, cannot be deleted at this time. Please retry your request later."

I have confirmed no jobs exist that back up the servers I'm trying to remove.

Thanks