Push notifications on shared lists for personal accounts is available in To Do. Push notifications for AAD accounts (work and school accounts) is work in progress and will be enabled soon.
An error occurred while saving the commentChris Milne commented
This is the feature I’m also missing having migrated from Wunderlist.
I use a personal account with colleagues and hate not getting a notification when a task is assigned to me as I used to with Wunderlist.