As per your given link I have visited there but again it is showing the same page instead of Google AdSense form page. I have make a complete video of it you can see. My AdSense account page is not coming only help centre page is coming
@TeamYouTube @YouTube https://twitter.com/TeamYouTube/status/1173510547427532800 …pic.twitter.com/OPVhY0RUcv
Thanks for sharing a video. Here's a guide to help you link AdSense and YouTube: https://yt.be/help/Ta2D . You can use an existing AdSense account or create a new one. Hope this helps!