How are you supposed to Backup Hyper-V 2012 with SMBv3 Storage?

I have 6 x HyperV Servers

All the storage is a on a 2012 SOFS Storage Array using SMBv3 to present to the HyperV Servers

Connection is 2 x 10GBaseT

Backup Sever is latest 2012 V-Ray with De-Dup and 70TB of iSCSI storage. 

But - I get

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