Hyper-V NDR Not Capturing Packets


We have setup and NDR device on Hyper-V running on Windows 2019 Server, we used the documentation and the video in the Wiki to carry out the install.

All looks like it has setup correctly but we are not getting any packets being captured.and after a period of time the appliance shows as unhealthy in Sophos central.

Any pointers as to where to start?

Is there any further documentation that might help?