What happens when I activate 2FA? July 07, 2022 08:00 Updated The One Time Passcode (OTP 6-digit number) will be sent to the email address you used to register for the McDonald's App. Related articles If I have turned on 2FA OTP, can I turn it off? What happens if I do not authenticate myself with 2FA? Can I reset/deactivate my account? How should I enter my credit card number? I am having issues with keying in promo code for deals. Why is this so?