phone works well with car play but i cannot get screen mirroring to work. have a new subaru that shows it but no joy with the 2018 glc. anyone have theirs working? iphone 8 running 15.2

thanks for any input.

 

My 2021 doesn't "mirror" my iPhone screen except for Apple or Google Maps. Audio program album covers will also show.

 

thats all mine will do also so i guess true mirroring not possible. thanks for the response.