There was scheduled maintenance on our side, which may have caused this issue.
So requesting you to check and confirm (do clear cache of your browser or try accessing in Private session).
If it still persist, they provide us following information :
1. Which OS you are using?
2. Which browser you are using to sign in to color.adobe.com ?
3. From which country you are accessing color website ?
4. Provide us the email id being used by you to sign in color services?
1. I'm using Windows 10.
2. I'm using Google Chrome
3. I'm accessing the website from Norway
4. My email id is firstname.lastname@example.org
I've had this problem when trying to log on several devices. I'm suspecting it maybe has something to do with my Adobe ID?