New settings for 2-Step Verification - google
http://googleappsupdates.blogspot.co.il/2016/06/new-settings-for-2-step-verification.html We know that security is one of your top concerns as a Google Apps admin and that many of you require your employees to turn on 2-Step Verification (2SV) to keep their accounts safe. There are multiple ways your end users can approve sign-in requests via 2SV—by tapping a Security Key , by entering a verification code sent to their phone or, starting today, by approving a prompt like the one below that will pop up on their phone. Your employees can now choose any of these options in the Sign-in & Security > Signing in to Google > 2-Step Verification section of My Account . The Help Center will be updated with detailed instructions soon; check back here for links to the relevant articles. Notes: Currently, you can't have Security Keys and Google prompt enabled at the same time. A data connection is required to use Google prompt. Android users will need updated Google Play Service