I hope this video can help you:
https://www.youtube.com/watch?v=dRHoId0-8qA
or this article
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
My previous iPhone had Microsoft Authenticator downloaded, which is what I used to log onto Facebook. This is no longer accessible due to water damage to the iPhone, now I can no longer login to Facebook. I cannot access this data, there was no back up codes set up. I need help restoring my account because without that information, I cannot login.