No access to API (AuthorizationError.SERVICE_ACCESS_DENIED) but ManagerAccount with Basic Access and Admin

[pandata]

Dear all,

I am trying to get reports from the AdWords API with python and I always get rejected with the error SERVICE_ACCESS_DENIED which means that I am not authorized to use the service (e.g. ReportDefinitionService).

I am using the googleads.yaml  file for authentication and checked the credentials serveral times (client_id, client_secret, refresh_token, developer_token).

The account to which I have access to via browser is a manager account linked to one customer account. My mail address is granted for an admin role.

Via the manager account I got the developer token with Basic access.

I noticed that this problem occurred for some other persons but they solved the problem privately. Could you please help?

https://groups.google.com/forum/#!searchin/adwords-api/SERVICE_ACCESS_DENIED|sort:date/adwords-api/XWIfIDWqRgY/J5seJ8ipBQAJ

https://groups.google.com/forum/#!searchin/adwords-api/SERVICE_ACCESS_DENIED|sort:date/adwords-api/DCBs6c0wFQc/R1K7AhwGDAAJ