Tasks Application Roles for Microsoft Graph

Role	ID	Purpose	Description
Tasks.Read.All	f10e1f91-74ed-437f-a6fd-d6ae88e26c1f	Read all users’ tasks and tasklist	Allows the app to read all users’ tasks and task lists in your organization, without a signed-in user.
Tasks.ReadWrite.All	44e666d1-d276-445b-a5fc-8815eeb81d55	Read and write all users’ tasks and tasklists	Allows the app to create, read, update and delete all users’ tasks and task lists in your organization, without a signed-in user