SQL virtual client is a primary replica on AoAG - how to backup

I have a customer who has 4 nodes in a SQL cluster.

2 nodes are in the MAIN site

2 nodes are in DR site

The 2 nodes in MAIN are in a FCI with virtual name virtual1 and virtual1 is a primary replica and the other 2 nodes in DR are secondary replica.

SQL in FCI with AoAG is not supported with Avamar hence I have to backup from the primary replica as a stand-alone. When I configure virtual1 on Avamar for backup, I can only see the local DBs, not the ones which are in AoAG.

As per user guide, AoAG in a SQL FCI is not supported and have to backup from primary replica. But can we backup from primary replica if the primary replica is a virtual server?

When I browse the physical node with "avsql --operation=browse --verbose", i get the error specified path '' does not exist or is not accessible

Output of avsql --operation=browse --verbose from 1 physical node.

c:\Windows\system32>avsql --operation=browse --verbose

Dynamically allocated CTL listen port (54664)

avsql Info <6673>: CTL listening on port 54664

avsql Info <10684>: Setting ctl message version to 3 (from 1)

avsql Info <16136>: Setting ctl max message size to 268435456

avsql Info <19484>: ===> sqlconnectimpl::check_smo_version

avsql Info <19482>: Found assembly: 'Microsoft.SqlServer.Smo,fileVersion="10.50.2500.0",version="10.0.0.0000",culture="neutral",publicKeyToken="89845DCD8080CC91",processorArchitecture="MSIL"'

avsql Info <19483>: Returning from SMO version check with value: 12

avsql Info <0000>: <=== sqlconnectimpl::check_smo_version

avsql Info <19487>: Start checking for SMO DLL version 12

SQL Server 2011 installed.

SMO 2011 managed DLL loaded.

avsql Error <15125>: Specified path '' does not exist or is not accessible

Terminating CTL listen thread

avsql Info <6451>: avsql returning with exitcode 536870919

Any suggestions are welcome.