Is there any way to always require the user to enter the PIN (instead of fingerprint) to unlock the device?
It seems that as soon as you add a fingerprint to the phone, now it no longer requires the PIN to unlock, just the fingerprint.
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You can try Next Lock Screen. During the initial settings, give the app the required permissions. Open the app, make sure that "Enable Next Screen Lock" is on. Click on Screen Lock, then "Next screen lock". Set a Pin for the app (preferably different from the PIN of your phone). Go back then, click on "Fingerprint lock" and turn it off.
Important: Don't disable the phone fingerprints that you set in Settings -> Security.
The app will work the following manner. If you enter your fingerprint first, then you will be required to enter the app's PIN.If you enter the app's PIN first, then you will be required to enter either the phone's PIN or your fingerprint.
Note: The app is no longer on the Play Store. I don't know if Microsoft will bring it back in the future.