AI-generated Key Takeaways
- 
          AuthenticationError.Reason is an enumeration within the Namespace https://www.google.com/apis/ads/publisher/v202508.
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          The enumeration provides specific reasons for authentication failures when using the Ad Manager API. 
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          Reasons for authentication errors include invalid login information, missing or ambiguous authentication headers, disabled API access, and issues with network association. 
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          Some error reasons point to problems with the provided authentication token, such as INVALID_OAUTH_SIGNATUREorMISSING_AUTHENTICATION.
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          Other reasons relate to the network or user account, like NETWORK_NOT_FOUND,NO_NETWORKS_TO_ACCESS, orUNDER_INVESTIGATION.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| AMBIGUOUS_SOAP_REQUEST_HEADER | The SOAP message contains a request header with an ambiguous definition of the authentication
                header fields. This means either the authTokenandoAuthTokenfields were
                both null or both were specified. Exactly one value should be specified with each request. | 
| INVALID_EMAIL | The login provided is invalid. | 
| AUTHENTICATION_FAILED | Tried to authenticate with provided information, but failed. | 
| INVALID_OAUTH_SIGNATURE | The OAuth provided is invalid. | 
| INVALID_SERVICE | The specified service to use was not recognized. | 
| MISSING_SOAP_REQUEST_HEADER | The SOAP message is missing a request header with an authTokenand optionalnetworkCode. | 
| MISSING_AUTHENTICATION_HTTP_HEADER | The HTTP request is missing a request header with an authToken | 
| MISSING_AUTHENTICATION | The request is missing an authToken | 
| NETWORK_API_ACCESS_DISABLED | The network does not have API access enabled. | 
| NO_NETWORKS_TO_ACCESS | The user is not associated with any network. | 
| NETWORK_NOT_FOUND | No network for the given networkCodewas found. | 
| NETWORK_CODE_REQUIRED | The user has access to more than one network, but did not provide a networkCode. | 
| CONNECTION_ERROR | An error happened on the server side during connection to authentication service. | 
| GOOGLE_ACCOUNT_ALREADY_ASSOCIATED_WITH_NETWORK | The user tried to create a test network using an account that already is associated with a network. | 
| UNDER_INVESTIGATION | The account is blocked and under investigation by the collections team. Please contact Google for more information. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |