When you want to use the Hyper-V module to manage your local VMs, the list stays empty and you get an error in the log:
User credentials cannot be used for local connections.
By default, only local administrators can manage Hyper-V VMs.
Add the user, that runs Royal TS to the local Windows Group "Hyper-V Administrators" and logout/login.
Another way is to run Royal TS elevated (with administrative privileges).