NetBackup 7.6.x with MS Hyper-V 2012 R2

The current environment that i have the following :

Master Server :- NetBackup Version 7.6.0.4

MS Hyper V Cluster 2012 R2 of 4 Nodes :- NetBackup Version 7.6.0.4

All the virtual machines hosted on the MS Hyper V cluster are ( Windows 2008 SP2 x64 / 2008R2 SP1 ) with integration services version "6.3.9600.16384"

I created the Job policy with type Hyper-V to backup on a deduplication storage unit and configured it with the virtual name of the Hyper-V cluster. However , some virtual machies is failing with error code "4201 - Incorrect snapshot method", although other virtual machines on the same host done successfully

And the bpfis log is attached, "I tried everything and still have the same issue with the virtual machine"