If your registration failed, there are three possibilities:
1. Your NIK / NOK unsuitable
2. Mismatch between your NIK and NOK
3. You have crossed limit simCard ownership for each NIK/NOK limit of three numbers
4. Makesure that you made registration on operational time based on Dukcapil regulations.
Please visit the nearest GraPARI to delete one of the SIM card numbers registered on your NIK/NOK.