Source: https://www.reddit.com/r/Android/comments/888ial/google_duo_31_rolling_out_with_initial_support/?submit_url=https%3A%2F%2F9to5google.com%2F2018%2F03%2F29%2Fgoogle-duo-31-account-linking%2F&already_submitted=true&submit_title=Google+Duo+31+rolling+out+with+initial+support+for+Google+Account+linking