Adwords API Create CRM Userlist WhiteListing Issue

I'm running the Google Adwords code samples against a test account I've created in Adwords. Most of the functionality works as expected. When I run the particular example : 201708.AddCrmBasedUserList I'm receiving the following error when trying to add users to a newly created CRM User List: [

CRM Based User List Samples Issues

I'm running the 201708.AddCrmBasedUserList sample against a test account. The code sample creates the crm user list properly, but encounters the following error when adding users to the newly created list : [NotWhitelistedError.CUSTOMER_NOT_WHITELISTED_FOR_API @ operations[0].operand.membersLis