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Check Synology Package Center. Verify Plex is running.
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You typed the local IP address into the browser, correct?
Clicking on the “Open” button in Package Center, using Synology QuickConnect, a domain name, app.plex.tv, etc will not work when claiming a Synology based server. Once claimed, you can use those methods to access the server. -
Are you on the same subnet as the Plex server?