Upgrading to NetBackup 10.3 and cluster environment
In the cluster environments such as NetBackup Cloud Scale and NetBackup Flex Scale, you must migrate cloud volume-associated credentials so that you can add the new engines in NetBackup 10.3 or later.
See the Migrating or upgrading MSDP Cloud and CMS topic in the NetBackup Web UI Administration's Guide to save the cloud credentials in CMS and establish the associate credentials with the existing cloud volumes.