Perhaps you are entering the certificate of the wrong child or trying to add your birth certificate.
Attach the certificate of a child who is 14 years old or older.
Have adopted a child or are its guardian.
They made a mistake when entering the series and its number in the application. Please check carefully and try to enter Ukrainian again.
Your full name, RNOCPP and/or date of birth do not match in the bank, in Diya and in the register. Check them at the bank through which you are authorizing. Or, if possible, try to authorize through another bank.