Hi Ken,
Thank you for providing more details to your concern.
Please note that the pairing of GCP is to developer token and not with Google Ads account. In addition to this, each Google API Console project can be associated with the developer token from only one manager account. Once you make a Google Ads API request, the developer token is permanently paired to the Google API Console project. If you do not use a new Google API Console project, you'll get a DEVELOPER_TOKEN_PROHIBITED error when making a request.
If switching to a developer token under a new manager account, then the usual workaround here is that you'll need to
create a new Google API Console project for Google Ads API requests that use the new manager's token.
However, since creating a new GCP is not possible or not applicable on your end, then I would suggest using the developer token that was initially paired with that GCP account so that you will not encounter the error.
Let me know if you have further questions.
Regards,
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| Ernie John |
| Google Ads API Team |
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