Membership in projects may be subject to Project Admin or Hub admin approvals. Outcomes of invites to Open, Closed, and Secret projects depend on Hub and project settings. By default, a BIM 360 Team hub is PC-enabled and any project you create is a Closed project.
The invite process works as follows if default hub or project settings are not changed.
For more details on how project and hub level settings influence the Invite process, see related topics below.
The illustration below shows the Hub role assigned to first-time users who are invited from projects when default hub and project settings are in effect: