iPad does not connect to new magic keypad? Why?

Well, you’ve told us absolutely nothing about your specific situation.

So all we can do is guess. I will take one guess. Perhaps you don’t have the required hardware. You need an 11” iPad Pro (1st or 2nd generation) or a 12.9” iPad Pro (3rd or 4th generation).

Your 2018/2020 iPad Pro needs to be running the latest iPadOS 13.4.1 update for the Magic Keyboard to be recognised by your iPad Pro.

Good Luck!

Which Ipad do you have?