Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear respected Derek,
Welcome to the Microsoft Community.
Based on the description shared, I would like to let you know that Copy Plan in the Plan of the Microsoft Planner will not copy the members of the Plan and here is the reference: Copy a plan - Microsoft Support
I suggest you to take this idea to the related development team by adding it as a feedback in Planner · Community (microsoft.com) which is the best place to share our ideas and improve the Microsoft products.'
Regarding the Notification in the Plan, please check the following article: Manage Planner notifications - Microsoft Support
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Mia | Microsoft Moderator