I also noticed that you are using one of the old scopes in the OAuthInfo
You will need to update that to the AdWords API scope:
*https://www.googleapis.com/auth/adwords*. Also, please make sure that you
are using the OAuth tokens generated with the AdWords API Scope as
mentioned in this blog
The error that you are getting doesn't seem to be because of this. But, you
will still need to make the changes to the scopes as the support for old
scope is being removed.
Sreelakshmi, AdWords API Team
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