It's very important that you get emergency alerts even when your do not disturb is turned on. Here's the steps to allow those notifications to come through to your device:
1. Swipe down from the top of the screen once using two fingers, or twice using one finger.
2. Tap > Sound and notification > Interruptions.
3. Choose if you are interrupted when you receive a new notification, tap when calls and notifications arrive, then tap allow only priority interruptions.
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