Productive currently does not support multiple assignees for a single task. However, you can work around this limitation by using subtasks, which can each be assigned to different people.
Workaround: Using Subtasks for Multiple Assignees
Create Subtasks:
Within the main task, add subtasks for each assignee. Assign a different person to each subtask.
This allows multiple people to work on different parts of the task, and each will see their assigned subtask in their Tasks overview.
Leave Main Task Unassigned:
If the main task doesn't need a specific assignee, you can leave it unassigned. The only required fields are the task’s Title and Task list.
Use To-Do Items for Smaller Tasks:
For less complex tasks, you can create To-Do items within the main task and assign them to different team members. This serves a similar purpose as subtasks.