You are being asked to update your account because the ID you submitted is expired, blurred, not in the list of accepted IDs, corrupted, or there is a mismatch in your registered name and your ID.
You will receive an SMS message from GCash asking you to update your ID. Here is a sample SMS that you will receive:
You will need to update your ID on your GCash profile within 1 month to enjoy GCredit.
Visit How do I edit my profile? to learn how to update your ID.