Assign few users manually, sync, and check if they can pre-boot.
If user group was removed, and that was the only mechanism to add pre-boot users, no wonder this stopped working properly.
Yes, but the group disappeared on its own-its not being removed by us......
We can add the group back in, and restart 8 or 9 times and get it to work again.
Same issue is happening to us currently. We think ours is a policy issue, would anyone know what policy changes would effect this?