PIN number for IPhone

Have IPhone 14 my pin number is 4 digits because only 4 spaces to enter the pin number

I am trying to pair my IPhone to my HarleyDavidson I states that it has found the IPone but ask for the 6 digit pin number for the IPhone to complete the pairing. Also having trouble with pairing to U-Connect in my Ram Truck

any suggestions besides going back to samsung?