I tried multiple times to add my account on Mail client app of Macbook with no success. I don't understand what's wrong. It keeps giving me "invalid credentails" error. 

I updated password, sign out and copy paste same password to log into mail from web as well as Mail client. But Mail client simply fails. 

I also went to Accounts to change password and when I tried that, it continues to sign in without any success. I see message "signing in.." until I cancel.

Can you please help?

thanks