How can we help you?
To increase security for its advertisers and API tool providers, Google changed the way that clients authenticate their accounts through the AdWords API from Client Login to OAuth2.
As a result, clients need to re-authenticate their Google accounts using OAuth.
Here's how to accomplish this re-authentication with your own credentials:
After clicking on the Upgrade Authentication button and clicking Accept on the next page, you may find that you are taken to a Redirect Loop error page. We believe that this is due to invalid characters in the nickname of your Publisher Client Accounts. For example, the use of an & ampersand.
Steps to resolve:
After clicking on the Upgrade Authentication button and clicking Accept on the next page, you may be taken back to the Linking Wizard and see that the Upgrade in progress status for this is stuck processing.