I can not associate my fully active AdSense account with my YouTube channel
<p>I have an AdSense account even I have earnings which comes from my Android applications I can see them under the Admob tab. Bu what I don't understand whenever I try to associate my AdSense account with my YouTube channel it gives me this error:</p>

<p><strong>You are currently signed into the Google Account *******@gmail.com, which is either not an active AdSense account, or still pending an approval. This account cannot be used to monetize your content.</strong></p>

<p>I really don't understand why I get this. I have an absolutely active AdSense account using the same gmail with my YouTube channel which is getting denied by the error you see above. I did even received a letter from Google 4 months ago which had a PIN in it so that I could approve my billing address. </p>

<p>Please help me understand what am I doing wrong here.</p>

<p>Many Regards!</p>