An invited waitlist entry cannot use ordinary Remove

Open Events → Events → select your event → Waitlist.

The ordinary waitlist Remove action rejects a registration that has already been invited, displaying Cannot remove an invited registrant from the waitlist. It is not a rescind-invitation control. Invitations have an expiration; if access must be withdrawn before it expires, contact support to review that actual registration and invitation. Do not delete unrelated completed registrations or assume reducing capacity revokes the private token.