Users should be instructed to sign in to their account and mark the activity as legitimate, and to also try the unlock CAPTCHA at www.google.com/accounts/DisplayUnlockCaptcha

Users should be instructed to sign in to their account and mark the activity as legitimate, and to also try the unlock CAPTCHA at www.google.com/accounts/DisplayUnlockCaptcha

https://support.google.com/accounts/answer/2461835?hl=en

I think it is not case with SupportFlow. I think if google think IP is suspicious it then expect user to visit the link with same IP (device) and enter the captcha. But in case of supportflow, there is no device. Also SupportFlow IP will be different from user IP. So unlock might not work

I'm not 100% sure, but I think it will, I've had to do it before. Their documentation doesn't make it clear, though.

For future reference, this article may also be helpful: https://support.google.com/mail/answer/14257?p=client_login&rd=1

We should also say that sometimes they put temporary blocks in place that you can't remove with any of their support tools, and you just have to wait until the next day.

Rather than making this a FAQ, it should be an admin notice when we detect a failure adding a Gmail account. That way people don't have to go hunting for it.