Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear Jo,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
Per the description shared, I would like to summarize the concern faced at your end i.e., one of the Plans in your Planner Hubs is missing and when you try to find it out, the Plan doesn't have a Plan Name (Plan heading), and you are finding a way to restore the Planner name.
If my understanding is correct, the behavior you encountered is not a known behavior and as far as I know, there is no feature to restore the previous version of the Plan in the Microsoft Planner.
In addition, I believe this problem need to be checked from the backend with the related development team, so I would like to suggest you to contact the IT admin of the organization and request them to create a support ticket from the Office 365 Admin center to have a further investigation. Reference: Get support - Microsoft 365 admin | Microsoft Docs
Thanks for your cooperation.
Sincerely,
Mia | Microsoft Community Moderator
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