@CarolineS I created a Group Hub in our Staging environment, subscribed, received a notification, unsubscribed, and still received notifications even though it shows me as unsubscribed. I created an open group and was signed in as an Administrator but not an admin of the group. I don't know much about Group Hubs yet since we haven't implemented it at this time but I did test to share what I experience. I didn't receive an error message when I unsubscribed, I just kept getting notifications which isn't expected, in my opinion.
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