See Unsent Messages On Messenger

Steps to see unsent messages on Messenger

• Step 1: Open the Messenger app, tap the Menu, then go to Settings.
• Step 2: Scroll down and tap Notifications & Sounds, then make sure notifications are turned on.
• Step 3: Go back to your phone’s main Settings.
• Step 4: Tap Notifications, then go to Advanced settings.
• Step 5: Select Notification History to review recent alerts. Scroll down and go to Messenger.

Result: Your Messenger notifications will be enabled, and you’ll be able to view past alerts from the notification history.

Tip: If you're still not receiving alerts, double-check that battery optimization isn’t restricting background activity for Messenger.