What happens if I do not authenticate myself with 2FA? July 07, 2022 08:11 Updated From 2 Dec 2020, McDonald's App users will not be able to access their account and enjoy the available deals without 2FA. Related articles I did not receive the two-factor authentication (2FA) email. What should I do? How many times can I try to enter the 2FA OTP before being locked out? How often does the user have to log in? How can I authenticate my app with 2FA if I happen to forget my email/password? How often will user be prompted for 2FA OTP?