I installed fb to my new phone and i successfully accessed it with my Microsoft Authenticator code, But for some reason my Instagram backup codes are not working.
You can turn this setting on or off at any time.
Click Next on that screen.
A: All authentications using the Microsoft Authenticator on Windows Mobile will be retired after July 15, 2020.
This is a really bad vicious loop that needs addressing.
Clear the Authenticator's Data and Cache from your device's app manager, restart the app.