@R Nev receiving a 2nd biometrics appointment for is fairly common. This can happen if ur biometric code changes or if USCIS needs updated information or additional checks. Make sure to attend the appointment, as it’s important for verifying identity and moving forward with the application. Stay positive! Code 1: 10 fingerprints only. Code 2: Index fingerprint, photo, and signature. Code 3: 10 fingerprints, photo, and signature.