*First, find the plex unique address that looks something like this (https://10-1-2-3.abcdef.....plex.direct:32400). You can find that by launching the plex app via plex.tv. Look in your browser developer console for the plex-server you are looking for. It should near the top prefixed with [Connections]. Use this address for the address you are connecting to plex with, not your local plex ip. Reason being, https certificates needs to be trusted. Then finally, enable https on your plex connection in Homey :)*
Got all the above done - ok but stumped by how do I ‘enable https on your plex connection in Homey’
That “direct” domain in the address only works if your router does not do “DNS rebind protection” or has plex.direct whitelisted for dns rebind. So maybe that is your issue as the app works fine for me. But I have plex.direct whitelisted in my router.
If you are victim to DNS REbind protection, Homey cannot reach the plex server using that address.