Username and Password is prompt always. And my credentials is always rejected too. On my Gmail account to eM Client

Please Help . . .

Hi Jeff, can you please make a screenshot of the issue? What version of eM Client are you currently using on your computer?
Are you completely sure you’re using the correct credentials?

Thank you,
Paul.

I have the same situation. I ́ve been trying to set up 3 different gmail accounts but 2 of them keep being rejected. I even turn off the security on the browser, don ́t know what else to do. 

Hi, can you please follow the instructions shown in the error (log in via your web browser)? Seems like this might be a configuration issue.

Thank you,
Paul.