I think it’s a bug, but when viewing about a community, the link to subscribe shows as Unsubscribe even though I’m not subscribed to it.
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Also nothing happens when hitting that button, so it’s impossible to subscribe to new communities via connect.
Indeed nothing happens when clicking that button. Though below
About Community
in the dropdown from clicking the three dots at the top, there should be an option to subscribe or unsubscribe. That should still be working, so you can still subscribe and unsubscribe with Connect!