Hi @eggy mcegg,
Thank you for posting in this community.
Unfortunately, there is no Api in Graph Api about retrieving audit log events for SharePoint plans.
However, you can log in to the Microsoft compliance portal to get audit log events for SharePoint Plans.
- Go to https://compliance.microsoft.com and sign into the Microsoft compliance portal.
- Select Audit
- Start a new search in the unified audit log.
This auditing capabilities capture activities in Planner that include read, created, modified, copied or deleted for a plan, task or roster, and also, capture record types such as PlannerTask, PlannerPlan PlannerCopyPlan. Since SharePoint Plans are implemented using Microsoft Planner, it is also included.
You can review the full list of Planner user and admin activities logged for auditing and the Planner schema.
Reference: Auditing capabilities coming to Microsoft Project, Microsoft Planner, and Microsoft To Do
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