This issue cropped up a couple of months ago under IOS 14.x and still occurs under IOS 15.
When the mobile app forces a reauthentication of my login credentials and after I reenable TouchID the splash screen showing my FICO 8 scores comes up but goes into a loop where the screen repeatedly refreshes about once per second and I cannot break out of it within the app. If I force-close it via the hold-button-swipe-up procedure or reboot my iPhone and then restart the app it will work normally until the next time I'm directed to reauthenticate.
It's not a dealbreaker but it is a recurring nuisance and I'm noting in case this is a known issue and/or I need to modify a setting or settings to address it.
I'm quite late in responding to this, but I have also been experiencing this issue for a while and it happened again a few days ago on the most recent version 3.0.5 (1) of the app and iOS 15.1.1 It happens every single time I have authenticate again and enable Face ID (@coldfusion mentioned Touch ID, so it's definitely common to biometrics) and the only way to get it to stop is a forced close.
I have this same issue on iOS.
I find it odd that I have to frequently re-set up the PIN and reallow Face ID. It defeats the purpose of enabling those features (conveniently and securely authenticate without the need to enter a password) if I have to log in with password, turn on Face ID, and choose a PIN again and again. I should only have to do this once on the same device like every other app that has this feature.
