At Pluriell, we have chosen to limit task assignment to a single person. When two people are linked to a task, the first person always assumes that the other should perform the task.
The creation of tasks within your environment is intended to structure your "to-dos" and reminders. This way, you can create a task from your projects, but also directly from a comment. This helps you keep track of your interactions with your clients and collaborators.
To find out which comment is linked to a task, refer to this article.
Useful tips : A private task is a task that you assign to someone but externals won't see it in their environment.