I am having an issue setting up Remote Access on my Plex server on my Synology NAS. I am using an Orbi mesh router. When I set up Plex on my iMac, remote access works fine when I open the port associated with the IP address of the iMac. But when I try to do the same on the NAS, I get a double NAT error. I only have 1 router in the house, so not sure what is going on. The NAS is hooked up to the router via ethernet.
Have you checked if the remote access is really broken/disconnected or if this is only the status indicator in Plex Web being off?
Can you play a video through Plex while you’re outside your home network?