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Linking the original thread as reference:

What version of WD‘s OS and what version of Plex Media Server do you have installed on that machine?

Server logs might show some details why it’s not working as expected.

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…