I'm attempting to use the AdWords to download a report of a client account using the credentials or its manager account (both test accounts).
When trying to do so I get a USER_PERMISSION_DENIED error. Looking at the common errors documentation it seems that the likely cause is the manager account not being liked to the client account.
So, I tried to link the two accounts but received an ALREADY_MANAGED_BY_THIS_MANAGER error, indicating the accounts are already linked.
I'm not sure how it's possible for the accounts to be linked and still receive the USER_PERMISSION_DENIED when trying to download a report.
How can I go about resolving this issue?
Thanks