Raspberry pi 4 "This server is unclaimed and not secure"

Plex Media Server NAS & Devices
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3

What IP address resolves if you run:
dig 192-168-1-22.CertificateUUID.plex.direct
And:
dig @1.1.1.1 192-168-1-22.CertificateUUID.plex.direct

You can find your find your certificateUUID using the information in this post (short version: it’s in Plex server’s Preferences.xml file):

They should both resolve to 192.168.1.22.