Microsoft Graph API: creating a plan returns 'MaximumPlannerPlans' exception

I am trying to create multiple plans for my Team/Group using Microsoft Graph API. When i call graph api for the first time for any specific group , its working fine .

But once first plan gets created , for rest of all the requests it is throwing "MaximumPlannerPlans :The request exceeded allowed limits" error.

Can anybody tell me how many plans for a Team/ Group can be created using Microsoft Graph API ?