# 42003
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/42003/index.md

This error occurs when the request is malformed or incorrect.

|             Title             |                                                                                  Details                                                                                   |
|-------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error Code**                | 42003                                                                                                                                                                      |
| **Remediation Category**      | Report or Escalate for Investigation                                                                                                                                       |
| **HTTP Status**               | 403                                                                                                                                                                        |
| **Error Type**                | Request Error                                                                                                                                                              |
| **Data Connect Alert**        | We ran into a technical issue, try again later or select another institution. (42003)                                                                                      |
| **Error Message**             | Testing customer should not add real accounts​.                                                                                                                            |
| **Common Causes**             | This error occurs when you attempt to add real account for test customers.                                                                                                 |
| **Troubleshooting Steps**     | Use active customers to connect live FIs. ​Use test credentials and simulated data for development and testing purposes, rather than connecting to real financial account. |
| **Data Connect Fix Eligible** | No.                                                                                                                                                                        |
| **Retriable by End User**     | No.                                                                                                                                                                        |
| **Access to Latest Data**     | You cannot access the latest data until the issue is resolved.                                                                                                             |

[Full Error List](https://developer.mastercard.com/open-finance-us/documentation/errors/error-list/index.md) \| [Request Errors](https://developer.mastercard.com/open-finance-us/documentation/errors/request-errors/index.md)