Sunday, January 12, 2020 10:09 PM
My email client suddenly became unable to log in to my Gmail account with the error message:
Please log in via your web browser: https://support.google.com/mail/accounts/answer/78754 (Failure)
However I was logged in via my web browser on two different devices, and even when providing the email client with definitively the correct password, the above error recurred.
The provided link wasn't very helpful.