Add Outlook tasks to Planner

kathrynr  I believe TO-DO can help you which is also part of the O365 bundle.

There isn't this integration built-in from what I have seen but with Microsoft Flow, you can get something similar for new Outlook tasks - https://flow.microsoft.com/en-us/galleries/public/templates/736f4350373711e7870df906aa521b7a/create-tasks-in-planner-for-new-outlook-tasks/.  Also, you can do it the other way around by the looks of it - https://support.office.com/en-us/article/see-your-planner-calendar-in-outlook-5dcccce5-2750-49b5-991b-1837379d96c7.

https://planner.uservoice.com/forums/330525-microsoft-planner-feedback-forum/suggestions/11037114-integration-with-outlook-tasks is a much-requested feature but in a recent update the product team explained their integration will be with To-Do instead, going forward:

"We also want to clarify confusion on why we’re integrating with To-Do rather than Outlook. Because Outlook Tasks on the web is being replaced with the To-Do web experience (100% consumer, and targeted release in March), this will be available to all Outlook Web users in addition to To-Do users. So, we’re integrating with To-Do because Outlook tasks will be To-Do tasks."