The blog post is vague, stating that only accounts that are "appropriately configured" will be automatically enrolled. This article speculates a bit that: > O

The blog post is vague, stating that only accounts that are "appropriately configured" will be automatically enrolled. This article speculates a bit that: > On Android, Google Prompt is a full-screen pop-up built into every device as part of Google Play Services, so that's easy. On iOS, Google Prompt requests for your account can be received by the Google Search app, the Gmail app, or the dedicated Google Smart Lock app. It sounds like everyone meeting these requirements will soon be enrolled in 2FA. So assuming this is correct, if your parents don't have an Android phone attached to the account, and don't have an iPhone with those apps installed, then this won't affect them. Of course, it'd be nice if Google was a little more clear on what they're doing, here...