Adobe Login stuck in a loop

Earlier today I got an e-mail giving me a security code. I never asked for one so I immediately switched passwords, activated authentication, added secondary e-mail address etc.

Now opening up Photoshop it got stuck in a login loop. It opens up the login window, loads it, closes the login window and then opens it up and does it all over again forever.

I shut down PS and all CC related stuff and opened just the Creative Cloud app. It got stuck in a loop too saying "loading creative cloud" for minutes.

I used the Creative Cloud Cleaner Tool to uninstall all CC stuff, but now trying to reinstall it tells me to login in the installer. I log in, it loads for a while and says it can't connect to the Adobe servers. I deactivate my antivirus and firewall as prompted and then try again but nothing happens.

I tried looking around Adobe guides seen here: https://helpx.adobe.com/x-productkb/policy-pricing/activation-network-issues.html

1-1. I could see the 2 adobe logos

1-2. The CC and CS6-link gave me a "400 Request Header or Cookie Too Large" - Deleting adobe cookies from chrome and re-logging in fixed this in chrome, not on the installer.

2. My hosts file was clean

3. I tested and can access secure sites, such as this forum right now.

4. My CurrentUser has NO certificates whatsoever. Using the certmgr search I've got 12 GlobalSign-certificates in other locations though.

Any help appreciated. I just bought a yearly photography license for $150 under a week ago and so far the software worked flawlessly. Thank you!