Attempted to migrate from AdWords API v201705 to v201708 and while running
existing code to get all customer accounts, this error was received.
AuthenticationError.CLIENT_CUSTOMER_ID_IS_REQUIRED @ ; trigger:'<null>'
Was there a change in v201708 so that clientCustomerId is required while
retrieving all customers in a managed account?
"Starting with v201607, if clientCustomerId is specified in the request
header, only details of that customer will be returned. To do this for
prior versions, use the get() method instead."
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