I Didn't Get a Push Notification (for iPhone)
This article is meant to help you troubleshoot problems with push notifications on an iPhone.
If you do not receive a push notification after enrolling your iPhone successfully, you can try the following solutions:
Enable Notifications for the Duo Mobile App
When you first download the app, a request appears asking you if you would like to allow Duo Mobile to send you notifications. You may have selected "Don't Allow" when this notification appeared, but you will have to allow notifications for the Duo Mobile app in order for it to work properly.
To allow notifications for Duo Mobile:
Go to “Settings.”
Scroll down and select “Duo Mobile.”
Allow notifications by tapping on the white circle.
NOTE: If you'd like to authenticate into your account without having to unlock your device, allow notifications and then change the notification settings to allow the notification to show on your lock screen.
Refreshing the Duo Mobile App
If you are allowing notifications for the Duo Mobile app but are still not receiving notifications, go to the Duo app and pull down the screen. This will refresh your account and load all missing notifications. Approve the authentication request, and you are done.
Checking Your Internet Connection
To use the Duo Mobile app, you will need a strong Internet connection. Try turning the Wi-Fi on and off to reset a wireless network that is having issues connecting to your device. If you have cellular data, turn off your Wi-Fi and use data instead in order to get a better Internet connection.