Thanks for your feedback!
With due date options in the Filter menu, and the ability to group tasks by due date category, we’re hoping that this will help Planner users find and organize upcoming dates and deadlines.
We understand there is still an ask for sorting tasks within an existing grouping, please continue to use this thread to share feedback on this.
The Planner Team
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This might seem like an obvious workaround however I was able to create adjacent buckets and just drag and drop in reverse order, maybe this would work best in a timeline that is backwards!