This seems to be a recurring issue. I've already tried Convert a free trial to a paid Adobe Creative Cloud membership but it didn't work. It's asking me for a serial number. I've already searched the forums on how to resolve this issue.
Surely it shouldn't be this difficult!
Does your Cloud subscription properly show on your account page?
https://www.adobe.com/account.html for subscriptions on your Adobe page
If you have more than one email, are you sure you are using the correct Adobe ID?
Log out of your Cloud account... Restart your computer... Log in to your paid Cloud account
This is an open forum, not Adobe support... you need Adobe staff to help
Adobe contact information - http://helpx.adobe.com/contact.html
Chat/Phone: Mon - Fri 5am - 7pm (US Pacific Time) <=== NOTE DAYS AND TIME
-Select your product and what you need help with
-Click on the blue box "Still need help? Contact us"