After i did all things i restarted my laptop and reïnstalled Creative Cloud. NOTHING CHANGED AT ALL.
i only saw something with firewall when i opened Creative Cloud for the first time, but i clicked directly on a button and was too late to read the whole message. and now its just login loop. Exactly same screen as before my post.
reset the cc desktop app, make sure it's in the foreground, then press:
Win: Ctrl + Alt + R Mac: Cmd + Opt + R
if that fails,
using a browser that allows popups and cookies, contact adobe support during pst business hours by clicking here, https://helpx.adobe.com/contact.html?rghtup=autoOpen in the chat field (lower right), type AGENT be patient, it can take quite a while to reach a human