Error message error validating application type oauthexception dating service for attached affair
(This is different from the canvas/tab page urls.) Thank you for your interest in this question.
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The code parameter is what I got from facebook callback. After some investigation I found the head-slapper - we doing a GET with HTTP Headers only not with a Querystring, so FB litterally wasn't seeing the Token at all.
The moral seems to be that if you can get the Token to validated in the FB Debug tool, there is likely /something/ amiss in your request - It might be a missing "/" or some other mismatch with the App's defined URL (Domain mistmatch is a different error).