First things first, check if canyouseeme.org can see your server listening on port 32400. If it does not, post a screenshot of your Plex remote access settings as well as your port forwarding options (remember to blur your public IP).
Have you gone through this guide yet? https://support.plex.tv/articles/200931138-troubleshooting-remote-access/
Edit: Just noticed that you’re using a FIOS router (which seem to be somewhat tricky to set up). Check out this thread which has a solution for getting it working: Remote Access - Not working
