Authorization failed, "Invalid JWT Signature."

[Rodrigo Munoz]

Hi

We have been using the Adwords API from the last two years using OAUTH2_SERVICE_ACCOUNT, and .p12 file to authenticate.

But since last Friday we are getting this error, and we were not able to make it work again.

Signet::AuthorizationError: Authorization failed.  Server message:
{
  "error" : "invalid_grant",
  "error_description" : "Invalid JWT Signature."
}

Has anyone had this problem ???

[Vishal Vinayak (Adwords API Team)]

Hi Rodrigo,

invalid_grant error is usually observed if your refresh token has expired. I would recommend regenerating your refresh token using the instructions avaliable for your client library here.

Regards,
Vishal, AdWords API Team