I've just created a new account, and added a new app. From there I see the client id (neatly in clientid- clienttag format).
In the interactive rhythm api console I go to the register page, and copy & paste the complete clientid in the box. I leave the userID box empty and hit the submit button.
In the URL generated I see my clientid in the hostname and my complete clientid and -tag in the parameters.
Yet after hitting submit I get a 'bad or missing client information ' error.
.. What's next? :)