Closed Policy for users to join the organization
You will not be able to find and join the organizations for public domains, if it has a closed policy set for the users.
And for private domains, if your domain is part of a closed organization policy account, you will be shown an error message.
Admins can block users from joining the org by disabling the "send request through mail" option while creating an org in Cliq. In such a case, users will have to reach out to the Org admin directly in person to join the organization.