I'm having a very similar problem. It doesn't matter what browser, computer or OS I use, when I go to appstoreconnect.apple.com I get a blank white page. I do not see any spinners, nor a login. I frequently travel between my office in Arizona and Pennsylvania - when I was last in AZ this was working fine. So maybe that has something to do with the error? Ether way, I am completely unable to access the appstoreconnect site at present. It would be grand if Apple could shed some light on this issue, as I am basically dead in the water here...

Extremely frustrating. I just purchased a shiney new M2 doorstop. I love the 'idea' of Apple Silicon, but for virtualization it's awful. I was resigned to compromising my needs and using a Dell XPS for virtualizing my Windows/Linux environments, but I bit the bullet and bought a nice M2 MacBook Pro with 32Gig of ram specifically and only to virtualize my macOS environments. I tried using UTM, ran into this issue and figured that UTM might be a little flaky, so I bought Parallels and had the same issue - which is ridiculously infuriating. Using your Apple Id is central to the macOS experience, its tentacles reach into everything, if it doesn't work, then macOS (effectively) doesn't work either. It's the equivilent of saying, "macOS works in a vm, but there isn't any mouse support!" - it's bonkers. I am pleading, Apple, please, please address this!