# 110002
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/110002/index.md

This error occurs when the username used in the request is not available.

|             Title             |                                                                                                                                  Details                                                                                                                                   |
|-------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error Code**                | 110002                                                                                                                                                                                                                                                                     |
| **Remediation Category**      | Invalid Input                                                                                                                                                                                                                                                              |
| **HTTP Status**               | 409                                                                                                                                                                                                                                                                        |
| **Error Type**                | Request Error                                                                                                                                                                                                                                                              |
| **Data Connect Alert**        | No associated alert.                                                                                                                                                                                                                                                       |
| **Error Message**             | Username is not available​.                                                                                                                                                                                                                                                |
| **Common Causes**             | This error indicates an issue with the username being used in a request, such as [adding a new customer](https://developer.mastercard.com/open-finance-us/documentation/api-reference/index.md#AddCustomer). This error can occur for if the username already being taken. |
| **Troubleshooting Steps**     | Use a unique username for the customer and retry.                                                                                                                                                                                                                          |
| **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.                                                                                                                                                                                                |

[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)