Enable 8dot3 name file setting for the NetBackup primary servers
For primary servers only: The NetBackup Messaging Broker service supports core primary server functions including backups, restores, alerts, and notifications. On a Windows system, the NetBackup Messaging Broker service fails to start if the 8dot3 short file name setting is disabled on the volume where NetBackup is installed. Use the Microsoft fsutil command to modify or confirm this setting.
More information is available: https://support.cohesity.com/s/article/article-100046867