When an outbound message fails, Meta returns an official numeric error code. Here is the lookup table with exact solutions:

Error Code	Error Name & Description	How to Fix
`131026`	Message Undeliverable: Recipient number is invalid, not registered on WhatsApp, or recipient has blocked your number.	Verify phone number format with country code. If number is valid, contact has either uninstalled WhatsApp or blocked your brand. Remove from active broadcast list.
`131047`	Re-engagement Message Required: 24-hour customer service window has expired. Free-form text cannot be sent.	You must send an approved Meta Message Template to re-engage the customer. Once they reply, the 24-hour window reopens.
`131056`	Pairing Rate Limit Exceeded: Too many messages sent in an unusually rapid burst before tier ramp-up.	Slow down dispatch rate. Enable batch throttling in your campaign settings (e.g. 50 messages/min).
`130429`	Rate Limit Hit: Daily messaging tier limit (e.g., 1,000 unique recipients) reached for your rolling 24-hr period.	Wait for the 24-hour rolling window to reset, or follow tier upgrade guidelines (maintain Green quality and send 50%+ capacity).
`132000`	Template Param Count Mismatch: The number of variables supplied does not match the approved template.	Check that all variables (`{{1}}`, `{{2}}`, etc.) in your approved template are properly mapped and provided with non-empty values.
`133010`	Phone Number Not Registered: The sender phone number is disconnected from Cloud API.	Go to Channels → WhatsApp and click Reconnect Account via Meta Embedded Signup.

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Channels & Meta API: Status monitors for connected WhatsApp numbers, Meta quality scores, and tier limits.
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