@SlackHQ Hello, on macOS, when the system Do Not Disturb mode is enabled (Notification Centered grayed out on the top-right corner), shouldn't the famous "Knock Brush" notification sound stop?
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Good to hear.
One final question because I don't want to mess this up: will I have to log back to my 27 workspaces manually? 
Hi Hugo! If those workspaces are all in an Enterprise Org you will only have to log in once. If they're not, unfortunately you'll need to log into each one manually.