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 for it to work properly. 

To allow notifications for Duo Mobile:   

1. Go to Settings.  

2. Scroll down and select Duo Mobile.  

3. Select Notifications.   

4. Allow notifications by tapping on the white toggle button.  

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.

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.

Go to the Duo Mobile app and pull down the screen. This will refresh your account and load all missing notifications. Find the notification you were trying to get and approve the authentication request.

If you are still not getting push notifications, you might need to check that Google Play is updated. If Google Play is out-of-date, update it.

You can also clear the Duo Mobile app cache to try and free up any trapped notifications. To clear the Duo Mobile app cache: 

1. Go to Settings.   

2. Select Apps and scroll down to select Duo Mobile.  

3. Tap Clear Cache.   

If none of the previous steps work, check that you are using a strong Internet connection. Try turning the Wi-Fi on and off to reset the wireless network. If you have cellular data, turn off your Wi-Fi and use data instead in order to get a better Internet connection.