Facebook Messenger: Troubleshooting message delivery issues
If you see a delivery failure error next to a message in your conversation, it means the message could not be sent successfully via Facebook Messenger.

Follow these steps:
2. Click Edit next to tawk.to Omnichannel Inbox.
3. Under Messenger Permissions, turn on the toggles for Access standby channel and Take control of conversations.

4. If your Facebook Page is connected to multiple apps, ensure tawk.to Omnichannel Inbox is the Primary receiver for handover protocol.
On your Facebook Page, go to Page Settings > Page Setup > Advanced Messaging.

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