Your API Client does not have the correct ACL (Access Control List) enabled. Solution: The developer site contains a matrix of which API endpoints require which ACLs. You must ensure your PowerSchool admin has checked boxes for REST API: Students: Read or REST API: Grades: Write .
: Dedicated spaces for testing your API calls and integrations without affecting live production data. How to Get Started powerschool developer site
Caveat: Webhooks are only available for PowerSchool Cloud customers. If your district is still on a legacy on-premise instance (Hosted by PowerSchool or self-hosted), you are stuck with polling the API. The developer site makes this distinction clear with a cloud icon next to the feature. Your API Client does not have the correct
Unlocking the PowerSchool Developer Ecosystem: A Comprehensive Guide powerschool developer site