AdSense Sign Up Error - Blogger New Earning Tab Interface Still Unstable

Update April 13th, 2021: For people who are still stuck with "AdSense doesn't know about your blog" problem when registering for new account using blogspot domain, check this new article: How to Create AdSense Account Using Blogspot URL - Fixing "AdSense doesn't know about your blog".

Update August 1st, 2020: It appears that Blogger and AdSense have addressed the issue by changing the registration method so this article is now outdated. AdSense now accepts blogspot link directly through "add site" feature. The "CONNECT ADSENSE" button will now be able to actually connect blogspot to your AdSense account.

In order to monetize Blogger using AdSense, we have to sign up via the Earnings tab. It is the only way to connect your qualified blog to AdSense. However, if you are using Blogger's new interface right now, you may encounter a problem.

Today I was contacted by one of my visitors, the owner of Understanding AdSense Eligibility Requirements for Blogger

I was also unable to associate my qualified blog using the new Earning Tab. My blog calon-imers.blogspot.com is eligible, so I tried to use the new interface to add it to my current AdSense account. However it gave me the same notification that AdSense doesn't know about my blog.