
"Please also make sure ImplicitSignInEnabled is not disabled" i did not have this setting available, because i had version 84 of the edge ADMX. but i just got version 94 of the admx, applied this policy setting as 'enabled,' and gpupdated/rebooted machine2, and the behavior persists.
"an auto sign-in hasn't happened before" - this may be the case, or at least i manually logged in to edge with the azure AD account. but right now, if i go into the settings app on machine2, and go to 'access work or school,' only my local AD is in there. under 'email & accounts," only my local AD is there. if i go into edge, there is one profile, and it is not connected to any account.
so how can i reset edge on machine2 so that it obeys the group policy telling it to log in with the local AD credentials? yes, the policy is being applied, per rsop and per the registry on machine2.