Discover mode - XG on Hyper V , only sees some multicast traffic

This is a evaluation in trying to prove a point, not service impacting.

XG on hyper V. Followed the guide https://community.sophos.com/kb/en-us/122971 all well.

I can manage teh XG via https ok.

Issue is with the discovery port not seeing much traffic ( pic bellow)

Im suspecting issue is with my hyper v switch

Phsycal mirror port is setup ok on a switch. That connects to a dedicated NIC on my hyper v host.

This is then presented to the XG

I am ticking "Microsof t NDIS capture" in the virtual switch manager

Any pointers / Suggestions pls?