My Facebook Developer account has email (verified) as enabled - however during account linking the email address is not obtained. You can see this in the One All account - as only Firstname, Surname and account are capture ... no email address (even though it is verified and primary).
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is it possible that you have declined to share the email during your first connection? Could you post a link to your website. I will then try to login and check if my email address is being requested and retrieved.