Why can't I connect my Pokeball Plus to PoGo?

Yesterday I bought a Pokeball Plus. Actually, I wanted to use the ball to play Pokemon Go. But somehow the ball can't be connected to my smartphone. At first I thought the ball might be broken, so I exchanged it for another. Unfortunately without success! Will not work again. My smartphone is a Huawei Mate 10 Pro and should not be out of date for the Pokeball Plus.

Does anyone have a similar problem?

I hope someone can help me, Google spits out nothing useful!

Maybe your phone is not compatible

How nice that you do not write what you do, but only restrict you to "do not go." For example, did you buy a ball that is just a Nintendo switch controller?

The Pokeball Switch Controller is said to be compatible with Pokemon Go (smartphone), according to the Internet.