Hello,
I installed Big Sur yesterday and I'm having trouble logging in to iCloud. I enter my AppleID and password, I get a verification code on my iPhone, I confirm it and then it says this:
View attachment 491807
I also tried to generate new data in PlatformNVRAM, resetting NVRAM doesn't help. AppleStore login works normally.
My configuration is: B550 Vision D, Ryzen 3900X, RX 5700XT, with EFI 0.62 from attachment.
On my another hack PC with Intel and SMBIOS my AppleID works OK.
Would anyone know how to fix this?
Otherwise, of course thank you very much CaseySJ for a great guide.
Zdenek