PR4100 Plex app configure error "Not Authorised"

After installing the Plex Media Server on My Cloud Dashboard, I have tried configuring the app and get an error that I cannot resolve. The error reads “Not Authorised - you do not have access to this server”. Can anyone help me with this issue? I tried looking for a previous post but cannot the same issue.
Any help much appreciated!

Hi @G3GMW,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting: