Synology Active Backup for Business Access Denied to VSS

I use a Synology NAS for backing up my Windows 11 PC.

Norton 360 seems to block accessing the VSS directories with the error message:

Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface.  hr = 0x80070005, Access is denied.
. This is often caused by incorrect security settings in either the writer or requestor process. 

Operation:
   Gathering Writer Data

Context:
   Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
   Writer Name: System Writer
   Writer Instance ID: {79c40293-6758-4b11-8bc7-840085d03d35}

If I (temporarily) disable Norton AutoProtect, the backup completes with no error.

How do I configure AutoProtect to not block VSS access from Synology Active Business?

Synology Support says to add \Device\HarddiskVolume* to the Exclusion list but this results in a "Invalid Path specified".

What is the correct entry?

Regards, oz