Microsoft Project
From Help Wiki
Microsoft Project is a project management tool.
Microsoft Project is not part of our standard license set and requires an additional purchase. Microsoft Planner, however, is part of our license set and can also be used to manage projects. To understand the best tool for task/project management see: When to use Microsoft Project, Planner, To-Do or the Tasks app in Teams
If after reviewing this info it seems clear that you need Project, please submit a New Technology Request but keep in mind you will need to purchase a Project license for all Team members that need to update tasks assigned.