A cloud-based task management app from Microsoft that helps users organize and manage daily tasks across devices.
Did you...
- delete the app and its data on your iOS/iPadOS devices?
- delete all not needed data on the server (i.e. completed tasks, old plans in Planner)?
- restarted your iOS/iPadOS devices before reinstalling To Do?
If you miss one of those measures, there's probably some data left that causes To Do to crash.