> ## Documentation Index
> Fetch the complete documentation index at: https://docs.natural.com/llms.txt
> Use this file to discover all available pages before exploring further.

# External Accounts

> Public error codes for External Accounts API endpoints

All error responses follow the standard [error format](/api-reference/errors/error-handling).
Validation errors (422) and rate limit errors (429) apply to all endpoints and are documented in the [Error Handling guide](/api-reference/errors/error-handling).

| Code                                         | Status | Detail                                                                                                                 |
| -------------------------------------------- | ------ | ---------------------------------------------------------------------------------------------------------------------- |
| `external_account_auth_consent_required`     | 400    | Additional Plaid Auth consent is required before this bank account can be linked.                                      |
| `external_account_auth_data_not_ready`       | 400    | Plaid Auth data is not ready for this bank account. Try again later.                                                   |
| `external_account_auth_permission_required`  | 400    | Plaid Auth permission is required before this bank account can be linked.                                              |
| `external_account_institution_unavailable`   | 400    | The financial institution is temporarily unavailable. Try again later or use another bank account.                     |
| `external_account_link_failed`               | 400    | Unable to link this bank account.                                                                                      |
| `external_account_no_auth_accounts`          | 400    | No eligible checking, savings, or cash management account is available to link.                                        |
| `external_account_no_eligible_accounts`      | 400    | No eligible bank accounts are available to link.                                                                       |
| `external_account_not_supported`             | 400    | This bank account is not supported for linking.                                                                        |
| `invalid_value`                              | 400    | The information you entered isn't valid. Please check it and try again.                                                |
| `unauthenticated`                            | 401    | Authentication is required.                                                                                            |
| `forbidden`                                  | 403    | You do not have permission to perform this action.                                                                     |
| `external_account_not_found`                 | 404    | External account not found.                                                                                            |
| `already_exists`                             | 409    | The resource already exists.                                                                                           |
| `bank_account_already_linked`                | 409    | This bank account is already linked.                                                                                   |
| `conflict`                                   | 409    | The request conflicts with the current resource state.                                                                 |
| `external_account_connection_disconnected`   | 409    | External account connection is disconnected.                                                                           |
| `external_account_connection_login_required` | 409    | External account connection requires reauthentication.                                                                 |
| `rate_limited`                               | 429    | Too many requests. Please try again later.                                                                             |
| `server_error`                               | 500    | Something went wrong.                                                                                                  |
| `bad_gateway`                                | 502    | We couldn't complete that request because one of Natural's services returned an unexpected response. Please try again. |
| `service_unavailable`                        | 503    | The service is temporarily unavailable.                                                                                |