AI-generated Key Takeaways
- 
          The page details the AuthenticationError within the StreamActivityMonitorService for the Ad Manager API version v202502. 
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          The AuthenticationError inherits from the ApiError class and includes fields like fieldPath, fieldPathElements, trigger, and errorString. 
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          The AuthenticationError specifically includes a 'reason' field which is an enumeration detailing various authentication failure causes. 
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          Possible authentication error reasons include invalid email, failed authentication, invalid OAuth signature, missing headers, network issues, and unknown errors. 
- Namespace
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               https://www.google.com/apis/ads/publisher/v202502
| Field | |
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| ApiError(inherited) | |
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| AuthenticationError | |
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 Enumerations 
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