Exchange cluster Backups fails with “Failed to get list of servers in Database Availability Group 'XXXXDAG' (4041319)

Exchange cluster Backups fails with “Failed to get list of servers in Database Availability Group 'XXXXDAG' as seen below.

• Job Message       2016/03/01 19:05:23       267        Data Plugin         F1EXCHMBX2     Preparing a VSS Incremental Backup
• Error      2016/03/01 19:05:24       267        Data Plugin         F1EXCHMBX2     Failed to get list of servers in Database Availability Group ''
• Error      2016/03/01 19:05:24       267        Jobs       F-INFR-077          Fatal error: Backup failed

DNS forward & reverse records are not configured.

Verify that the reserve and forward lookup can resolve the FQDN and the IP address. These commands can be used to confirm the resolution from all nodes involved:

• nslookup <IP address>
• nslookup <hostname>