We'd like to help. Are you seeing any error message while linking your AdSense account to your channel? Also, have you followed the steps mentioned in this Help Center article to setup your AdSense account: https://goo.gl/Sebmor ? Let us know.
Just to confirm, are you seeing an error message while trying to contact the AdSense Support team? Any screenshot would help us looking into it. Also, could you try using a different device to see if it helps? Keep us posted.