Can't access server remotely

Have you tested the port forward from outside your home network (e.g. using a service like canyouseeme.org)?
The remote access status indicator „tuning out“ like this usually means it was never working but took extra long to perform the status check.

Did you already have a look at the related troubleshooting support article?

https://support.plex.tv/articles/200931138-troubleshooting-remote-access/

There’s also a guide with some more details on how to troubleshoot remote access issues.