Microsoft To do has functionality to share one or more task lists with your colleagues. You can then delegate tasks to colleagues so that you work together towards a common goal. You can also share a list just to keep your colleagues updated about your work tasks.
To share a list, click the person icon in the top right. From there you can invite your colleagues through e.g. Teams or Outlook.
If you choose to share the task list with one or more colleagues via e-mail, a message with a link to the task list will be sent to them.
By clicking the link, your colleagues will be taken to Microsoft To do where they can accept the invitation.
You can now see who is participating in the list.
This feature is especially beneficial for collaborative projects, as it allows team members to track progress, assign tasks, and communicate within the context of the shared list.