Setting up a Wireguard Server to access Plex away from home

[Bitrudeuk]

Hi All,

I am trying to replace my OpenVPN setup with a Wireguard one and am being let down by one device in the chain. This was in the hope that the connection would be faster on Wireguard.

Property 1 has an AX86U running the latest Merlin Firmware, with Wireguard VPN's set up on the router for access via PC, Laptop, Phone, Shield Pro and AX88U at Property 2.
Property 2 has an AX88U running the latest Merlin Firmware.

The end goal is to access my Plex media server running on a QNAP NAS at Property 1 via a Shield Pro at Property 2

I am currently at Property 2 and have been able to access Plex via my phone, PC and iPad, but the Shield Pro will connect to the Wireguard server, but Plex won't access the media server on my NAS at Property 1??

As everything else is working ok, I can only guess that the Shield Pro is the issue? Does anyone have any ideas, or should I just give up and revert back to good old OpenVPN for the Shield Pro?

Has anyone else come across this problem? I've seen a few questions asked about setting up the server, but nothing about having issues with the Shield Pro and accessing the server once it's set up?

Many thanks

D