Hi @Josh M Wilson ,
Welcome to Microsoft Q&A forum and posting your question here.
I created a Planner in Microsoft 365, and it was automagically added to my Outlook 2016 Desktop application.
According to my search, Outlook calendar sync in Microsoft Planner allows users to view their Planner schedule in Outlook. This feature is turned on automatically in Planner.
If you are a global admin and you want to turn off calendar sync in Microsoft Planner, you can use Windows PowerShell.
The detailed steps for your reference:
- Prerequisites for making Planner changes in Windows PowerShell
- Turn off or on Outlook calendar sync in Planner using PowerShell
Open PowerShell and run the following command to turn off Outlook calendar sync for Planner: Set-PlannerConfiguration -AllowCalendarSharing $false
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