# 20001
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/20001/index.md

This error occurs when the account number is not found.

|             Title             |                                                                                            Details                                                                                             |
|-------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error Code**                | 20001                                                                                                                                                                                          |
| **Remediation Category**      | Verify Account or Data State                                                                                                                                                                   |
| **HTTP Status**               | 500                                                                                                                                                                                            |
| **Error Type**                | Request Error                                                                                                                                                                                  |
| **Data Connect Alert**        | No associated alert.                                                                                                                                                                           |
| **Error Message**             | Real account number not found​.​                                                                                                                                                               |
| **Common Causes**             | Ensure that you're attempting to retrieve details for a valid account number.                                                                                                                  |
| **Troubleshooting Steps**     | Retry with a valid account number. If 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 will be unable to retrieve the latest data until the issue is resolved.                                                                                                                    |