---
page_type: error
code: 30709
message: "30709: Subscribers Must Be Opted In When Providing an Opt-In Message"
level: ERROR
---

## Description

When registering an A2P 10DLC campaign, an opt-in message is required if the campaign involves subscriber opt-in. If an opt-in message is provided, the campaign must ensure that subscribers are properly opted in before messages are sent.

### Possible Causes

- An opt-in message was provided, but there is no clear opt-in process for subscribers.
- The campaign setup does not align with opt-in policies.

### Possible Solutions

- Ensure that subscribers explicitly opt in before receiving messages.
- Provide an accurate opt-in process that aligns with compliance guidelines.
- Review Twilio's A2P 10DLC opt-in compliance requirements.