DPM 2016 Backup Guest Cluster w/Shared VHDs

I am running DPM 2016 on a physical 2016 Server.

I am migrating my four node 2012 R2 cluster to a four node 2016 cluster.  As it stands, the four new 2016 nodes have been added to the 2012 R2.  The VMs are able to migrate from node to node without issue.  However, I have three, 2-node guest clusters.  Each have at least 2 shared VHDs.  If the guest cluster nodes are on a 2012 R2 node, then DPM is able to back the VM up without a problem.  However, if I move one or both of the guest cluster nodes to a 2016 node, DPM will not back up the VM.  Instead of a backup in DPM, a checkpoint is created in Hyper-V.

Any ideas?

Thx

Rob Nunley