HealthHub as the national digital health app relies on the official records from the Ministry of Home Affairs (MHA) to perform eligibility check on nationality/ citizenship and Parent-Child relationship, as well as records from the Ministry of Education (MOE) to ascertain the Legal Guardian of a child.
As you were recently granted permanent residence status in Singapore, it may take some time before the official records are updated.
If you still encounter issues to add your child after a few working days, you can reach out to us at contact_us@healthhub.sg for further assistance.