Premium plans use a different backend, afaik they're not supported currently in the Graph API. You can try the Project schedule APIs instead: https://learn.microsoft.com/en-us/dynamics365/project-operations/project-management/schedule-api-preview
Why am I not able to access Premium Plans over Graph API?
Delmar Kit
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Hello. I try to access a premium plan in Microsoft Planner over Graph API. But the get Plan with correct Plan ID gives me back a "requested item is not found". If I search for Plans contained in a group, no premium plan is found only basic plans...