Error when running a Google Ads Script — “MutateError.UNSPECIFIED: The project number associated with the request is not allowed when the 'internal-client' HTTP header is set.

[Markus]

Hello Google Ads Scripts Team,

while running one of our scripts, I encountered the following error message:

"[UserError: MutateError.UNSPECIFIED: Call to GoogleAdsService.Search failed: The project number associated with the request is not allowed when the 'internal-client' HTTP header is set.]"

After this, I tried executing the script again, and it worked without any issues.

Could you please clarify what this error means?
Was this just a temporary outage on the API side, or could this indicate a potential issue that might reoccur in the future?

Thank you in advance for your help and clarification.

[Google Ads Scripts Forum Advisor]

Hi,

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

In order to investigate the issue further, kindly provide us with the following details.

• Google Ads account ID/CID
• Name of the affected script
• Screenshot of the error (if any)
• Shareable spreadsheet link if you are using any in the script. You may follow this article to share a file publicly

You can share the requested details via Reply privately to the author option or a direct private reply to this email.

Thanks,
 

Google Ads Scripts Team

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[2025-10-06 21:00:41Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01u8MNv:ref" (ADR-00334709)