The error that you received 'Client is unauthorized to retrieve access
tokens using this method' implies that the service account needs to be
authorized properly. This
will help you setup GSuite authorization for service accounts. However, do
you actually need service account functionality, or could you simply use
offline access as described in the alternative to service accounts
of the guide. Either way, please let me know if you have further questions.
Dhanya, AdWords API Team
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