Microsoft has not yet added the ability to recover deleted plans in Planner. It is possible to recover deleted groups, but this is only helpful if the plan was deleted as part of the group.
Microsoft Planner: Now you can recover deleted Plans and Groups - Microsoft Community Hub
If you accidentally deleted a plan, the only way to recover it is to recreate it from scratch. You can do this by creating a new plan and adding back the tasks, due dates, and other information that was in the original plan.
The following post explains how to Restore/recover deleted plans, buckets, tasks in Microsoft Planner using 3rd party app: https://blog.apps4.pro/restore-or-recover-delet...
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