I have a Samsung EVO Plus 128GB Micro SDXC Class 10 U3 card in mine and it works just fine.
Plus, SDXC is card capacities above 32GB, which I imagine a great many users have installed, and this is the first complaint I've seen.
For the record, I'm running with a Lexar 633x 64GB SDXC
Personally i am more than happy with the 64GB of internal space the Nokia 8 has without resorting to moving things to an SD Card, i just don't have that many apps to worry about.
My card is used for photo, music and video storage and i would rather it remain portable and totally separate for the internal file system.
Same here. Apps stay where they are