Hi Veer, Thank you for reaching out to the Google Ads API support team.
The "OAuth client was not found" error occurs when the OAuth2ClientId/OAuth2ClientSecret specified is not correct. Could you check if it is valid and also that it does not have any extra space? In addition, I would suggest to recreate the client id and client secret and generate a refresh token using the new client id and client secret. Since you are using a service account authentication method, I recommend reviewing the service account documentation once more. To investigate the issue further, could you share updated complete API logs (request and response with request-id and request header) generated at your end? 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 Feedback How was our support today? [2025-04-25 07:57:23Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01qUyFH:ref" (ADR-00301810) -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog: https://googleadsdeveloper.blogspot.com/ =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "Google Ads API and AdWords API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/adwords-api/u9njC000000000000000000000000000000000000000000000SV9KRN00JzRM1ztfSV-0xmToqGf8nQ%40sfdc.net.
