Cant connect on 2015 iMac

[skittle0764]

Ok, ik it alr sounds bad, but i have this old iMac on which i put linux, and bc its basically the only device that has a real GPU, i wanted to use it for vrc. but whenever i try to connect it gives me an "Invalid Version" or something similar error, even tho i matched the versions. idk if the issues the radeon GPU or something else, but i would love someone to help me. i use a quest 3s btw, and run debian and fedora on the mac