I would like to give access to Plans (just viewing) on one specific project for one external user.
What do I need to set on the permissions for this user?
Is it required to create a group first for this one user to set permission on this person?
Is it required to put this external user to the User Management User List of my company?
Important is also that this user is not allowed to see other plans or to see other projects, just for the specific project only.