Not sure why it's not connecting for you unfortunately, worked for me first time with it being on the exact same screen as yours.
The ottocast unit has a blue steady light while connecting to the iDrive system, and just worked from there really ...
Update on the ottocast i3...
It works! But no android auto, completely overlooked this.... The quality is pretty solid, as a way to get Waze on the screen is a solid option, but I think I'll stick to ID6 nav for now
As the title suggests, wondering if anyone else has got the Ottocast i3 for BMW?
It says that it works on iDrive 6 which I believe means that it could connect to the Apple Carplay without having to search from the car?
https://www.ottocast.com/products/ottoaibox-i3?ref=SimpleCarGuy
I bought one...