Recently I'm having the exact same issue with CC and Windows 11. Unable to connect to Adobe server though I've followed every troubleshooting steps on Adobe support page.
So, I started support chat yesterday. Adobe tech spent more than 2 hours trying to remote fix my PC without any success.
So, tried installing CC on a Windows 10 labtop and worked just fine. There is an update obviously either from Adobe or Microsoft that messed up security and connection. I pay annual fee to Adobe and can only use now PS for some reason!! Other apps, including illustrator and Acrobat will not work!!