Cloud Catalyst to MSDP Cloud migration is not supported on 10.3 MSDP servers
To migrate Cloud Catalyst to MSDP Cloud using the nbdecommission -migrate_cloudcatalyst command, you must use an MSDP server running NetBackup versions 10.0.0.1 to 10.2.0.1.
The primary server can be running NetBackup 10.3, but the MSDP server on which nbdecommission is executed must be running one of the NetBackup versions in the range above.
See the NetBackup Deduplication Guide Appendix B for more details.