LG WEBOS 3.5 All remote play stop working

It looks like this is possibly related to the LetsEncrypt root certificate expiring today, but there are many other people reporting similar issues over on this thread: PMS suddenly shows issues with remote access 9/30/2021 10AM EST

I’ve had the same issue starting later this evening for me, UTC-6 though.
Device Details:

  • LG 55SM8600PUA
  • webOS Version: 4.9.3-5380409
  • Software Version: 05.10.30 (not sure how this is different than webOS)
  • Plex App Version: 5.0.1