LG Web OS Plex version cannot access my media server

Server Version#:4.34.4
Player Version#:latest
Two LG TV’s both connected to local network, plex media server also connected to local network.
Roku Plex app (6.6.8.6594) works fine, as does android phone on local network wifi and 4g. All worked fine yesterday. LG App whots Plex2 (my media server) and a local network IP as unavailable, the media server continually reports Not available outside your network, checking retry re-enabled remote for it to fail in minutes. have manually added port and setup port forwarding in TP Link Deco router. (still works over 4g even with this message)
Very odd as I have had Plex since it started (Barkley was a mere pup) and this is the very first issue.
Plex media server recently upgraded to windows 10 20201 build 200822-1922.

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