FNB Requires Password for Online App Despite Biometric Setup

The FNB Online Banking App allows biometrics. Once in a while, it stops using biometrics and asks for the password. I have a 20-character password made up of mixed characters. I don't remember this password. I can reset it, but I need a card number. I have a virtual card and need to go to the Banking app to see its number, which is inaccessible. Can't use my banking. If I had a card it wants a 4 digit pin. You have a 1 out of 10000 chance to crack it, or after 5 seconds if you could run 1000 guesses per second. A 20-character password with mixed characters, if you could try a billion (109) combinations per second, it would take you approximately 1.93 x 1022 years to exhaust all possible combinations. Now why FNB would think it wise to stop the mobile app's biometrics every now and again I can't tell you. If I have a gun to my head, neither my finger, nor the 4 digit code, nor a 20-character password would stop a person from accessing the account. A fingerprint scanner sits behind the pattern password of my phone. So, what's the point of "needing" to use the password for the mobile app every now and again, to make sure you have the actual access, with the weakness of the reset process? It makes no sense.