KeywordPlanIdeaService.GenerateKeywordIdeas

[yakuo]

Hi Google Ads API Team,

We’re seeing intermittent authentication failures when calling KeywordPlanIdeaService.GenerateKeywordIdeas. The issue affects some Google Ads accounts but not others using the same app credentials.

Endpoint

POST https://googleads.googleapis.com/v19/customers/{CUSTOMER_ID}:generateKeywordIdeas

Request body

{ "keywordAndUrlSeed": { "keywords": [""], "url": "" }, "pageSize": 100 }

Observed error (from our logs)

statusCode: 503 message: "Google Ads Error: 2 UNKNOWN: Getting metadata from plugin failed with error: invalid_grant" error: "ServiceUnavailableException"

Symptoms

• Only some customer accounts fail; others succeed with the same setup.

• Always using the same developer token and login-customer-id (MCC level).

• Endpoint and request payload are identical across working/failing cases.

• Rotating to a newly re-consented refresh token sometimes resolves the issue for a given account.

[Google Ads API Forum Advisor]

Hi,

Thank you for reaching out to the Google Ads API support team.

Based on the provided information, I understand that you are encountering an invalid_grant error, The invalid_grant error usually indicates an issue with the refresh token. That said, you’ll need to regenerate credentials and refresh tokens. You may refer here to this guide for the steps on how you can regenerate credentials and refresh tokens. You may also check this sample code for generating user credentials.

Additionally, I could see that you are using a V19 version. I would suggest you upgrade to the latest version, ’v21’, as soon as possible to benefit from new features. You may refer to this documentation on deprecation and sunset for more information regarding the specific deprecation and sunset dates for each available version.

If the issue persists, please provide the complete API logs (request and response with request-id and request header) generated at your end when calling the API so that we can check from our end and assist you further.

If you are using a client library and haven't enabled the logging yet, I would request you to enable logging for the specific client library that you are using. You can refer to the guides Java, .Net, PHP, Python, Ruby or Perl to enable logging at your end. For REST interface requests, you can enable logging via the curl command by using the -i flag.

You can send the details via Reply privately to the author option, or direct private reply to this email.

 

Thanks,
 

Google Ads API Team

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[2025-09-02 13:32:08Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01u5axd:ref" (ADR-00331587)