Create Planner tasks within Outlook
Add new Planner tasks to an existing Plan from within Outlook, including turning an email into a Planner task
Anna Riling commented
You can add your Planner calendar to Outlook calendar, but it's read only. https://support.microsoft.com/en-us/office/see-your-planner-calendar-in-outlook-5dcccce5-2750-49b5-991b-1837379d96c7. I would like the ability to add tasks to Outlook and see/edit them in Planner, and vice versa.