Can’t Register AppleCare for my iPad - broken link

Hello Community,

I bought myself an iPad Pro and Apple Care in a store. I wanted to register Apple Care and followed the instructions in the booklet which in the end led me to the page with both of my devices (MacBook and iPad).

I added the correct day I bought the iPad and apple tells me it is eligible for an apple care product.

But by clicking on ’add coverage’ I’m led to a broken link:

We’re sorry This link has expired. Please check your coverage to begin purchasing AppleCare products.

I can’t find a way to register my product. I don’t want to buy anything - I already have it. And I can’t find a register button that doesn’t lead me to the broken link.

Im thankful for any help!