Google oauth failed sign-in message is incomplete

I have a secondary email associated to my account. I had forgotten about it, and tried to sign-in with the secondary email address via the google sign-in button. I got the 422 message below.

It is not clear from the 422 message that the email might be registered as a secondary email. Even if it is indeed associated to an existing account, I cannot use it to login.

I suggest the error message also includes the following step:

  • You might have tried logging in with a secondary email. Try logging in with your primary email.Screen_Shot_2015-07-23_at_12.35.13_PM

/cc @marin @dzaporozhets @DouweM @rspeicher