Notifications are set per Inbox

You'll only be notified of messages arriving in Inboxes where notifications are enabled.

Set notification sound on the Settings page

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Not receiving desktop notifications?

1. Confirm that notifications are enabled for the associated Dispatch Inbox (see above).

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2. Confirm that you're not in Do Not Disturb mode.

You can toggle it on/off with [Control+\].

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3. Open System Preferences and confirm that notifications are enabled for Dispatch

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4. If you use a Focus Group, confirm that Dispatch is added as an app to that Focus Group.

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Disable Slack desktop notifications

For all your "inbound" in Slack, you'll want to use Dispatch. So notifications from Slack will lure you out of it.

1. go to preferences > notifications
2. "notify me about..." > check "Nothing"
3. then check "Use different settings for my mobile devices"