Set the DNS server for the Plex server machine and the computer running your web browser to use either Google’s public DNS 8.8.8.8 or Cloudflare’s 1.1.1.1
Are you using a standard web browser without any browser add-ins?
Don’t use Brave or other highly restricted browsers.
Disable all add-ins.
Is the server PC running a Windows Server Edition?
If you do, follow this instead: Plex install fix for Windows Server (Claim issue)
