Multiplayer - Can't find sessions?

Does anyone have any ideas on how to diagnose why the Multiplayer-Shootout exe cannot find any sessions
between a Win7 and Win10 PC?

What I know so far:

  • Network discovery is shared on both the Win10 and Win7 PCs

  • Each machine can ping the other Successfully

  • Each machine can access files on the other successfully

  • Previously, the Win10 PC was running Win7 and the Multiplayer-Shootout worked fine in that case.

  • The most recent Multiplayer-Shootout demo on the market place was used and it fails to find any lobby sessions

I just can’t get the multiplayer to work with the Win7->Win10 setup and have run out of ideas
regarding what the issue could be.

Any thoughts from anyone who has experienced this issue will be appreciated.

Cheers.