Unable to claim server on network

I am currently running Mac OS High Sierra on a Mac mini, I am a Plex plus member and when I sign into my computer I get an error message that says “this server is unclaimed and not secure”. There is a button to claim server next to this message. When I click it it doesn’t do anything. I have tried to redo everything but still no luck.

I am running Plex on a laptop too and there is a separate server there and I tried to move it to my desktop using the instructions Plex provided with no better results.

Any suggestions?