There is a Synology FAQ on the forums here in case anyone needs a link.
@mjbarthman (re)claiming a server gets covered here on the forums a lot, especially by ChuckPA, in posts with a common word like preferences.xml
or claim
and on the plex website article
In Chuck’s posts, the FAQ, and the article you should find a consensus if that’s okay not to paraphrase. If you still have problems, consider opening a new forum post so that you get everyone’s attention.