Thanks for the reply.
I managed to figure out how to make Spotify work yesterday night.
I downloaded MIUI 14.0.3.0 "Thor" to my PC and installed it via fastboot to the phone -everything works now.
The phone is also a lot faster and the camera works better (had some minor focus issues, now...
When I type in my username and password, the message "Something went wrong" "Try again" appears, I click on the "Try again" and it still doesn't work.
Anyone else have this problem? Is there a fix?
Does Spotify work on the Xiaomi 12S Ultra and if yes, what version of MIUI are you using?
Thanks!