Avamar and Exchange Cluster AAP-less backups

Hi,

We run Avamar 7.3 (About to upgrade to 7.5).

Meanwhile we need to run backups of our new Exchange 2013 servers on Windows 2012 R2. The exchange servers are setup as an AAP-less cluster. I can't find any description of how to set up a ExchangeVSS-backup of a AAP-less Exchange cluster. So I've tried to follow the recommendations. What I do know is that we get an error message in the AvamarClusterConfiguration-log when trying to configure a DAG-backup.

Error in m_ci - >create_cluster_group_network_resource(). Error code=5090, details are 'This operation is not supported on a cluster without an Administrator Access Point'

I find very little information on the subject Avamar-Exchange and AAP-less clusters. What are our alternatives or what do we do wrong? Do we need to upgrade to Avamar 7.4 or 7.5?

Best regards

Jorgen