Some plans in Planner aren't attached to a Microsoft 365 group. These plans are used when it would be cumbersome to add another group, and when the plan is temporary, for example when you create a plan from a task list in meeting notes.
Because these plans aren't attached to a Microsoft 365 group:
- There is no owner. Any member can add or remove other members and edit or delete the plan.
- There is no associated OneNote or SharePoint site.
- You can't comment on tasks.
- You can't upload attachments.
- When the last member leaves the plan, the plan is automatically deleted.
Otherwise, you can use these plans to track and assign tasks as usual in Planner.