With Ref. to 'Sjpt' response.
Adobe Live Chat: http://www.adobe.com/support/chat/ivrchat.html,
or as a slight short cut try http://helpx.adobe.com/contact.html?product=digital-editions&topic=usi ng-my-product-or-service
Click on 'I still need help' and then you should see 'Chat with an Agent' at the bottom of the page.
'Ask our experts' will indeed just lead you back to this forum.
Sometimes you will get ‘Sorry! All agents are busy— please check back soon.’
Don’t refresh the page, just hang on and it should eventually go to ‘Chat Now, and agent is available’.
They can reset your authorizations, and then you must reauthorize any devices you still need.