2FA Duo Push notification Support
2FA manual OTP support is addressed via this issue - #15760 (closed).
Currently Gitlab does not have UI to support Push Notifications from Duo Authenticator. One of the Solution is proposed here - #15760 (comment 1307564728) to support push notification from Duo where the request will automatically time out after 60 seconds but the UI/UX experience in this approach is questionable.
This Issue is to explore on how to integrate PUSH
notification mechanism from Duo with Gitlab.