My server is not claimed?

Client wouldn’t play, assumed I needed to reboot the server, go to server, see it needs an update, install update see the following message:

This server is unclaimed and not secure
Claiming this server will associate it with your Plex account.
This helps your devices find each other and helps keep your media safe.

What does that mean?

What does the claim button do? I did click it, but it just sat there.

“Claim” uses the authentication tokens already in your browser to sign the server into your account. Being signed in is what makes it visible by name

You can always ignore it and go to Settings Server General and sign it on there.