# 42000
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/42000/index.md

This error occurs when the request is malformed or incorrect.

|             Title             |                         Details                         |
|-------------------------------|---------------------------------------------------------|
| **Error Code**                | 42000                                                   |
| **Remediation Category**      | Report or Escalate for Investigation                    |
| **HTTP Status**               | 400                                                     |
| **Error Type**                | Request Error                                           |
| **Data Connect Alert**        | No associated alert.                                    |
| **Error Message**             | Testing customer limit exceeded.                        |
| **Common Causes**             | The preset customer limit for testing has been met.     |
| **Troubleshooting Steps**     | Contact your support team member to discuss next steps. |
| **Data Connect Fix Eligible** | No.                                                     |
| **Retriable by End User**     | No                                                      |
| **Access to Latest Data**     | No                                                      |

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