You may require to reset your Google or Facebook password and try logging into the McDonald's App again. If you cannot log in, don't hesitate to contact the customer support team using the Mobile App Feedback form. There is nothing other way to recover your Mcdonald's account.
If you want more information related to McDonald's read this blog: https://www.triphippies.com/mcdonalds-mystuff-2-0-login/
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How do I recover my Mcdonald's account?