I presume this is DSM 7?
If so, and given I don’t see any servers registered to your account.
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Uninstall the server package with the “KEEP” (uninstall only) option
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Reinstall the same package EXCEPT use the ‘New or lost’ servers
– (Plex Claim Token option) -
Click the hyperlink to Get Plex Claim Token
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COPY the claim token then PASTE back into the window on the installer form.
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Click next-next-done and allow it to install.
6 IF your networking is ok –
It will take a little longer than normal (it’s obtaining new credentials for you) -
If successful, it will also report it was successfully claimed to your Username when done.
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Now you can open it.