If you set the group hub to hidden, nobody except those in the group can see it. Are you wanting to just send folks a link to request access? To accomplish this, you could: Create a closed group On the overall permissions, set the permission to view group hubs to deny Add a role for "Internal" onto the node, and grant the "view group hub" permission You will now be able to send the link to "Internal" users who can view/open/request to join, but the rest of the world will not be able to see that group hub or know that it exists.
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