Enum describing possible customer user access errors.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/errors/customer_user_access_error.proto)

| Enums ||
|---|---|
| ## `DISALLOWED_ACCESS_ROLE` | Unable to add or update the access role as specified. |
| ## `INVALID_USER_ID` | There is no user associated with the user id specified. |
| ## `LAST_ADMIN_USER_OF_MANAGER` | Last admin user cannot be removed from a manager. |
| ## `LAST_ADMIN_USER_OF_SERVING_CUSTOMER` | The user can't remove itself from an active serving customer if it's the last admin user and the customer doesn't have any owner manager |
| ## `REMOVAL_DISALLOWED` | Unable to remove the access between the user and customer. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |