I can confirm what
@Fingernail says. The only way to use iCloud, App Store, etc. is to create a macOS Sonoma VM, connect to AppleID, and then upgrade it to Sequoia. That has worked for me (with VMware Fusion on Intel host).
Now (beta 3) my VM is asking me to verify my AppleID recovery key. I am avoiding this as I expect it to fail and, possibly, lock me out!
I suspect we a living dangerously by trying to use our everyday AppleID with the Sequoia beta. Safer, if you need to explore iCloud and AppStore apps, is to create a new AppleID.
Last year there were no such problems, but betas in some previous years had issues because Apple was changing iCloud. Maybe the same this year.