I enrolled to the Google Advanced Protection Program to benefit from the increased security. I use Sandboxed Google Play on my GOS phone.
After having set up the two security keys through Vanadium on the Google account website, I got logged out from all my sessions for security. I logged in again to my Google account on the Google website through Vanadium with no issues, using my Nitrokey FIDO2 key.
However, when I tried to log in again to my Google account directly from GOS, after having entered my password, the screen got stuck on the “2-step Verification” page and the usual popup window for 2-step verification process (that popupped correctly in Vanadium) never appeared here.
I tested also by deleting my Google account from GOS settings and re-adding it, but to no avail.
How come? Both Vanadium and GOS use the same installed sandboxed Google Play Services. Also, few days ago, before enrolling to the program, I had to manually delete my Google account from GOS. Since I was already using FIDO2 key, I had to insert it after having entered my password, and at that time it worked perfectly.
Is it possible that this program allows Vanadium to log in but no GOS since it’s not the stock OS?