Gmail is not working on my macbook pro
I've changed password on my gmail account and I wanted to changed it on my macbook as well and it's giving me
'error 400 saying I can't sign in to this app because it doesn't comply with Google's Auth 2.0 policy for keeping apps secure. It says i let the developer know that this app doesn't comply with one or more google validation rules" I have no idea what to do. My gmail works on website, on my phone without a problem. Thank you for your help.
Sarka
MacBook Pro 13″, macOS 10.13