# 20028
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/20028/index.md

This error occurs when the request is malformed or incorrect.

|             Title             |                                                                                                                     Details                                                                                                                     |
|-------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error Code**                | 20028                                                                                                                                                                                                                                           |
| **Remediation Category**      | Verify Account or Data State                                                                                                                                                                                                                    |
| **HTTP Status**               | 404                                                                                                                                                                                                                                             |
| **Error Type**                | Request Error                                                                                                                                                                                                                                   |
| **Data Connect Alert**        | No associated alert.                                                                                                                                                                                                                            |
| **Error Message**             | Invalid Real Account Number​.                                                                                                                                                                                                                   |
| **Common Causes**             | It indicates that the account number provided in your request does not match any account in our records or is not in the correct format.                                                                                                        |
| **Troubleshooting Steps**     | Double-check the account number is accurate and adheres to the standard format. If the issue persists, submit a [support ticket](https://developer.mastercard.com/open-finance-us/documentation/support/index.md#create-a-support-case-in-scm). |
| **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.                                                                                                                                                                                  |