Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
The error is most likely caused by a group‑membership/permissions issue rather than licensing, even if listed as an owner.
When a Microsoft 365 group or team is created through certain admin paths (for example, Microsoft Entra admin center or custom scripts), owners are not automatically added as members. Planner requires the user to be a member of the underlying Microsoft 365 group to create or manage plans. Being owner‑only is not sufficient and leads to failures when creating or sharing a plan.
Resolution steps:
- Confirm that the account is a member of the Microsoft 365 group that backs the plan, not just an owner.
- If not a member, add the account as a member:
- Use Outlook (desktop or web):
- Go to Groups → Discover groups.
- Find the group that corresponds to the team/plan.
- Select Request to join. If already an owner, membership should be granted automatically.
- Or, if permitted, use the Microsoft Entra admin center to add the account as a member of the group.
- Use Outlook (desktop or web):
- After membership is added, reopen Planner and try sharing or editing the plan again.
Once the account is both owner and member of the group, Planner operations such as creating, sharing, and editing plans in that group should succeed.
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