A "Linked " user doesn't have a sign in. They are instead managed by another user, known as the "lead user". The lead user must be a full user.
They don't have their own email address, all communications is via the lead user.
This category is primarily intended for use by families when:
These users are shown in the "Current Users" section as Linked
When the lead user signs in, they will be prompted to pick a user. If they chose one of the linked users, they "become" that user, i.e. they see data as if that user had signed in. They can change back at any time using the "Switch" button on the top right.
Each linked user has their own permission rules, they don't "inherit" the permission of the lead user
This category is similar to a club managed user, but with a club managed user it is the club who is responsible.