Trying to backup a HyperV cluster with a large number of vm's (100+).
Cannot browse hyperv cluster to create Backup Selection set.
Upgrade the Hyper-V plugin to 10.5.1, which has been confirmed to resolve this issue.
You can download the latest version from the following link:
Note: version 10.5.1 of the Hyper-V Plugin requires that the NetVault server and any clients running the plugin be at version 10.0.5 or higher.