Above issue happens while you are already signed in and still try to login again and again. I had faced same error so did below experiments
1) I opened a website on my mobile and everything was fine.
2) Then I attempted on another laptop and used a different gmail account to login and it again worked fine for me.
3) On the first laptop I tried again by clicking on "Signin" button but I got same error, so I opened the google.com then logged out completely from it and then tried again, this time it worked for me. So I strongly believe, Issue is just clicking login button again and again without logging out.
I hope it fixes your issue.