SnapCenter 1.1 - VSC 6.2P2 attaching virtual disk failed

Hi together,

Problem: Attaching virtual disk stays at 50%  

Environment:

Ontap 9.0RC1

VSC 6.2P2

SnapCenter 1.1

vCenter 6.0U2

SVM (6 volumes): NFS 

What we´ve done:

DomainUser with full rights in SnapCenter and vcenter, assign this user to VSC Backup role on the  which was created by using rbac.

Added the VSC-host in SnapCenter --> SnapCenter automatically added the SVM connection and detects the policies.

Backup is running fine, only attaching fails.

What could be the problem?

Thanks!