### Answer I don't have specific information about campaign registration errors and billing issues in the available sources. However, based on similar registration issues documented in the community, this appears to be a backend system issue that requires Retell AI support intervention [(1) ]() . Recommended steps: 1. Identify your Workspace ID - You can find this in your workspace settings page 2. Contact Retell AI support with: - Your Workspace ID (org ID) - Screenshots of the error message - Details about the $15 charge - Information about the rejected application 3. Support channels: - Visit [Contact Sales]() - Ask questions on [Discord]() 4. After resolution - Clear your browser cache and re-login before retrying Similar billing and registration issues have required manual review by the Retell AI team to resolve backend problems before users could successfully complete their registrations [(1) ]() [(2) ]() .

​ To learn more, see the sources I considered: [[1] Error when trying to invite members to a workspace](https://community.retellai.com/t/error-when-trying-to-invite-members-to-a-workspace/380) [[2] 10DLC Registration Issues Even with Correct Information](https://community.retellai.com/t/10dlc-registration-issues-even-with-correct-information/597) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.