Dear Chen Chih Cheng
There are many reason why you may not be able to login -- sometimes it is a Telco issue, not a PG issue. We would need details in order to effectively troubleshoot so that you can enjoy the PG app! Please email us at MOE_Parents_Gateway@moe.gov.sg. State Telco you are using.
UPDATE (30/1/24): We're still waiting to serve you.