I’ve seen a few reports by users who very recently got their Plex Pass who had trouble to stream remotely. Seemingly the Plex app still told them about remote access restrictions and requiring a Plex or Watch Pass. Rebooting server and app appears to have fixed that for most.
In your case, it seems the remote access is „simply not working“ (no warning about the remote playback restriction / requiring a Plex Pass…). So I assume this isn’t related.
Did you already have a look at the troubleshooting guide, e.g. verifying your port forward is configured correctly and the router is visible on that port from outside your home network (with the router’s WAN IP, the IP recognized from the outside and that seen by PMS in the remote access settings matching)?
