By domain
Anyone signing up with an email on an allowed domain can auto-join — set by system admins.
Organizations
An organization gathers people into a formal group — with members and managers, group-based permissions, and its own free-form attributes. It's a profile itself, so it lives in the same system as everyone else.
Members & roles
People join an organization as members, and some of them manage it. Access is granted to security groups rather than individuals, so it follows the group rather than the person — and a group is typed as users or administrators.
Signup channels
New members can be admitted however fits — and each channel assigns the security group they land in, so people arrive with the right access from the start.
Anyone signing up with an email on an allowed domain can auto-join — set by system admins.
Admit specific email addresses individually, for named invitees.
Generate a token and hand it out; whoever redeems it joins with the assigned group.
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