Sketchup Pro 2021 won't let me add classic license details

Anyone had any luck with the following message?

SketchUp was unable to contact the license server.

Please check that your computer is connected to the internet. If your computer is online, our license server may be experiencing a temporary outage.

It looks like you added the license to Joe’s machine ok.

Could be worth thinking about whether you need some SketchUp subscriptions, then more of you could be signed in and using SketchUp, and not have to transfer the license as much.