# 30640: Message couldn't be delivered

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when Compliance Toolkit identifies the destination phone number as having elevated compliance risk and blocks delivery. When the TCPA Known Litigators Check blocks a message, Twilio returns 30640 in the error logs and API response.

### Possible causes

* Compliance Toolkit identified the destination number as associated with elevated compliance risk.
* The TCPA Known Litigators Check was enabled for your account or subaccount, and the destination number matched a phone number believed to be associated with prior TCPA-related legal activity.
* The message was treated as non-essential traffic, such as `marketing` or `events`, which is blocked when the destination number is identified by the known litigators check.

### Possible solutions

* Remove the destination phone number from your marketing, communication, or outreach lists.
* Verify that you have valid consent before sending messages to this recipient.
* If the message is an essential use case, set `messageIntent` to the correct value, such as `otp`, `notifications`, or `customercare`, so Compliance Toolkit can classify the traffic correctly. Essential traffic is exempt from the known litigators check.
* If you have verified consent and need to bypass this check for a specific request, set `riskCheck` to `disable` when you create the message.
* Keep compliance checks enabled by default. Use overrides only when you are confident that the recipient has provided valid consent and that your messaging complies with applicable requirements.

#### Additional resources

* [Compliance Toolkit for Programmable Messaging](/docs/messaging/features/compliance-toolkit)
* [Message resource API reference](/docs/messaging/api/message-resource#create-a-message-resource)
* [Send SMS and MMS messages](/docs/messaging/tutorials/how-to-send-sms-messages)