You are not allowed to set REMOTEDSMAGentnode option. Data Protection for Microsoft Exchange Server is not licensed to perform offloaded VSS backups.
The REMOTEDSMAGentnode option is used to perform offloaded VSS backups.
The operation stops.
In order to perform offloaded VSS backups install a valid fully-featured license. If you use Data Protection for Microsoft Exchange Server it is also required to purchase and install IBM® Tivoli® Storage Manager for Copy Services - Microsoft Exchange VSS Integration Module. Contact your service representative to find out purchase details.