Once a team has been created and contains at least one user it will appear on the list of users to pick activity assignees from. More specifically, on the Activity details section Assignees section, teams appear in a special section of the list of users to select assignees from, named Teams.

If a team is empty, or has already been assigned to the activity, it will not appear on the list of users.

To assign a team to an activity:

1. While in the Activity details section, turn to the Assignees section.
2. Click '+' button to open the drop-down list of users to select from and locate the team as an item in the Teams section on the list.
3. Select it and click 'Save'. The users who are part of the team will be added to the list of assignees.