How can we resolve the access denied issue, we are trying to create event from user calendar via graph API.

Question

Answer 1

Are you logged in with the same user, or trying to create a meeting on behalf of him or? What permissions you have on said Calendar, and what permissions are you running the Graph explorer with (check via the Modify permissions tab)? Generally speaking, you should be following the steps here: https://learn.microsoft.com/en-us/graph/outlook-create-event-in-shared-delegated-calendar?tabs=http%2Ccsharp