Subscription not working

We can't help you with subscription enquiries directly, but in this instance, the action you take is pretty clear; Uninstall the version of Audition that you have, and make sure that the CC app is up to date and that you're correctly signed into it. Then download the version of Audition that shows up there. That will register correctly, because logging into the app will only enable what you've paid for. If for any reason this doesn't work, then you have to contact Adobe directly, I'm afraid.