Hi Francis. I'm Greg, 10 years awarded Windows MVP, specializing in Installation, Performance, Troubleshooting and Activation, here to help you.
Here are guides for how to operate Microsoft Authenticator app, including links to various How-To's about password, pin, etc:
https://support.microsoft.com/en-us/account-bil...
https://support.microsoft.com/en-us/account-bil...
https://docs.microsoft.com/en-us/azure/active-d...
https://www.youtube.com/watch?v=RpX7JgexdwA
https://www.youtube.com/watch?v=jTwtosQkn6I
Usually one of those will clear up any questions for how to use Authenticator app.
Based on the results you post back I may have other suggestions if necessary.
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