We don't have an explicit feature that only allows users from a certain domain to join but are working on it on our roadmap.

However, you can limit the people who join your universal channel but only sending them invites via email. The links that are sent in email invites are specific to that email address only.

For example, if I send an email invite to sammy@acme.com, they would only be able to join my universal channel by clicking the link and logging in with his sammy@acme.com account.

If you want users from any domain to join, you can simply send them the invite URL (app.m.io/uc/acbde).

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