I have a different browser set up with my Gmail login. When I go to login with my Gmail, your Creative Cloud launchs the default brwoser.
No problem, this happens often to me with external programs. The problem is your terrible authentication system that probably marked the SSO token as used as soon as it hits the browser. This implementation is not necessary!!!! I should be able to copy the URL to another browser and just use it! I am a developer with a degree in softare security and there is NO REASON AT ALL that your system is implemented this way. It doesn't create a more secure system in the slightest. It just makes me come here at tell you that this is another strike against your archaic software and reason to migrate away from Adobe.
Not to mention the bugs I found while filing this bug!!!