Guest users in TuCalendi are people who are part of a team within a TuCalendi account.
These users have been invited by a person who owns a TuCalendi account and has the ability to create workgroups.
Invited users have a different role than the account owner. For example, they cannot send invitations to new users.
Note that a person may have been invited to join one or more independent work teams and at the same time be the owner of their account. When a TuCalendi user has been invited to several groups, associated to the same email, they can switch from one workgroup to another in a very simple way, which is explained in another help article.