I have a membership and have been paying monthly for a few months, but creative cloud won't let me buy the products after the free trial. It just takes me to the purchase plan page on the adobe website... but I'm already paying for it so I'm not sure why the full version won't open when I'm logged in.
Please refer to the links below.
Also please ensure that you are using the right adobe ID to sign in.
Hope this will help you.