Plex not finding libraries after restore from time machine and Big Sur update

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You can do this in Terminal.app without a ton of pain.

Stop Plex.

Do this to get a list of what’s in there:

% defaults read com.plexapp.plexmediaserver

Then do this to remove the ...Identifier keys and the old token.

% defaults delete com.plexapp.plexmediaserver AnonymousMachineIdentifier
% defaults delete com.plexapp.plexmediaserver CertificateUUID           
% defaults delete com.plexapp.plexmediaserver MachineIdentifier
% defaults delete com.plexapp.plexmediaserver ProcessedMachineIdentifier
% defaults delete com.plexapp.plexmediaserver PlexOnlineToken
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