Confirm notifications are enabled for Signal. Android phone Settings > Data usage > Menu/More > Auto-sync data > OK to enable auto-sync data. Android phone Settings > Wi-Fi > Menu > Advanced > uncheck Wi-Fi optimization. Android phone Settings > Wi-Fi > Advanced > Always keep Wi-Fi on during sleep. Confirm you have enabled WiFi or cellular data while your phone is asleep. You can free up space by deleting apps that are not on the SD card. Check that you have free space in internal memory, not the SD card. Check if your linked Signal Desktop has already viewed the message. Confirm you have not muted notifications for the contact or group thread. 
Confirm you have not blocked the contact. Signal Settings > Notifications > Enable message notifications. Android Settings > Apps (then Manage Apps for some users) > Signal > Check on Show notifications. Check that you have enabled notifications on your phone. Check if the notification appears in your Android notification bar or tray. 
Confirm that the date and time settings for your phone are set correctly for your time zone. Upgrade your Android OS to the latest version that is available for your device. Update the Android System Webview app on your phone. Update the Google Play services app on your phone. Update to the latest version of Signal Android. Make sure that your VPN or other apps are not restricting Signal's ability to connect to the internet. Check that your provider allows WebSocket connections. If are on a campus or corporate Wi-Fi that has firewall restrictions in place, contact the network administrator. 
Android phone Settings > Network & Internet > toggle to turn Airplane mode on and off.
Confirm that your phone is connected to the internet. Steps to resolve will vary by phone model and OS. macOS users will see notification text of "New Message" for all Disappearing Messages regardless of the setting in Signal Settings > Preferences > Notifications. Manage this option in Signal Settings > Notifications. Notifications for reactions will only appear if you choose to display Name and message in the notification.
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