@Tony Resolved the issue with adding .local.

@Tony RDP now working with IP addresses. However, fails when addressed by machine name.

@Tony I have applied the second solution you suggested which is turning the uplink router into n AP. I had done this int the past - so no issues. This all started with trying to attempt an RDP...

As mentioned/shown in the diagram, I am able to ping and get a response from M2 to M1. Unable to do the same from M1 to M2. I suspect some setting or a bug in the Archer C4000 router is the cause of...