AI-generated Key Takeaways
- 
          The content lists various Ad Manager API services with links to their AuthenticationError documentation for version v202508. 
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          It details the inheritance hierarchy for AuthenticationError, showing it inherits fromApiError.
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          The AuthenticationErrorincludes fields likefieldPath,fieldPathElements,trigger, anderrorStringinherited fromApiError.
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          The AuthenticationErrorspecifically has areasonfield which is an enumeration listing various authentication failure causes.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
| Field | |
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| ApiError(inherited) | |
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| AuthenticationError | |
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 Enumerations 
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