nbdevconfig (Synthetic full backups)

I'm attempting to enable synthetic backups in my environment. I'm trying to run the following command on my master server for each of my disk pools.

nbdevconfig -changedp -dp US_STI_DADO_NSIDDO1_LSU02_NETBPNY2P04 -stype DataDomain -setattribute OptimizedImage

But I'm getting the following message when I run the command.

DSM was unable to find the following disk pool: US_STI_DADO_NSIDDO1_LSU02_NETBPNY2P04(DataDomain)@nmadep11.zit.commerzbank.com
Unable to update
failed to change disk pool, invalid command parameter