How to assign tasks to users in Microsoft To-Do
To assign a task in Microsoft To-Do:
- Click on a task.
- Click on "Assign to" in the task details pane.  Click on the name of the user to whom you want to assign the task.
Applies to all versions of Windows 10
Microsoft To-Do now offers task assignment support for all users, allowing you to assign individual items to users within shared lists. Typically, this functionality would be used to indicate the person responsible for a particular task.
To use the assigned tasks, you must have a shared list in To-do. You can follow our dedicated guide to start using a shared list for your users. Once you have created your list and added some users, you will be ready to assign them your tasks!
Select any task in the list to open its details pane. Then, click on the "Assign to" button to open the assignment pop-up panel. Here you will see all the users who have access to the list. Click on their name to assign them the task. You can also assign the task to yourself or share the link in the list again to invite a new user.
Once you have assigned the task, the person's name will appear in the task details panel. You will also see your profile picture again in the main task list, so you can see at a glance who is working on each item. To change or delete the assignee, simply click on its name in the details pane to return to the "Assign to" message.
More information: Microsoft To-Do