I cannot open or log into Creative Cloud because it won't move past 'sign in' command

This is what I see every time, and when I click 'sign in' it just disappears and comes back. I can't even put in my details to TRY to sign in!

I've tried restarting the computer, etc. but I can't even uninstall and reinstall because to be able to uninstall the app I need to be logged into the app, which I can't do.

It's driving me insane and also means I can't download any more of the creative cloud apps because I need to be signed in, which I'm not. I am able to access my already-downloaded apps just fine and am logged in to them. My credentials aren't the problem. I don't know how to fix this and can't find an answer anywhere. Help!