Enum describing possible authentication errors.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/errors/authentication_error.proto)

| Enums ||
|---|---|
| ## `ADVANCED_PROTECTION_NOT_ENROLLED` | An account administrator changed this account's authentication settings. To access this Google Ads account, enable Advanced Protection in your Google account at <https://landing.google.com/advancedprotection>. |
| ## `AUTHENTICATION_ERROR` | Authentication of the request failed. |
| ## `CLIENT_CUSTOMER_ID_INVALID` | Client customer ID is not a number. |
| ## `CUSTOMER_NOT_FOUND` | No customer found for the provided customer ID. |
| ## `DEVELOPER_TOKEN_INVALID` | Deprecated: Developer tokens have been sunset. The developer token is not valid. > [!WARNING] > This item is deprecated! |
| ## `GOOGLE_ACCOUNT_AUTHENTICATION_FAILED` | A problem occurred during Google account authentication. |
| ## `GOOGLE_ACCOUNT_COOKIE_INVALID` | Google account login token in the cookie is invalid. |
| ## `GOOGLE_ACCOUNT_DELETED` | Client's Google account is deleted. |
| ## `GOOGLE_ACCOUNT_USER_AND_ADS_USER_MISMATCH` | The user in the Google account login token does not match the user ID in the cookie. |
| ## `INVALID_EMAIL_ADDRESS` | The email address provided is invalid or does not exist. |
| ## `LOGIN_COOKIE_INVALID` | Login cookie is not valid. |
| ## `LOGIN_COOKIE_REQUIRED` | Login cookie is required for authentication. |
| ## `NOT_ADS_USER` | The Google account that generated the OAuth access token is not associated with a Google Ads account. Create a new account, or add the Google account to an existing Google Ads account. |
| ## `OAUTH_TOKEN_DISABLED` | OAuth token in the header has been disabled. |
| ## `OAUTH_TOKEN_EXPIRED` | OAuth token in the header has expired. |
| ## `OAUTH_TOKEN_HEADER_INVALID` | OAuth token HTTP header is malformed. |
| ## `OAUTH_TOKEN_INVALID` | OAuth token in the header is not valid. |
| ## `OAUTH_TOKEN_REVOKED` | OAuth token in the header has been revoked. |
| ## `ORGANIZATION_NOT_APPROVED` | The Cloud organization associated with the project is not approved for prod access. |
| ## `ORGANIZATION_NOT_ASSOCIATED_WITH_DEVELOPER_TOKEN` | Deprecated: Developer tokens have been sunset. The Cloud organization associated with the project is not associated with the developer token. > [!WARNING] > This item is deprecated! |
| ## `ORGANIZATION_NOT_RECOGNIZED` | The Cloud organization associated with the project is not recognized. |
| ## `TWO_STEP_VERIFICATION_NOT_ENROLLED` | An account administrator changed this account's authentication settings. To access this Google Ads account, enable 2-Step Verification in your Google account at <https://www.google.com/landing/2step>. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |
| ## `USER_ID_INVALID` | User ID in the header is not a valid ID. |