You also need to make sure that the user "NCF\sql_services" has access to the location you're trying to create the file in.

If it is a network drive, remember it won't be mapped if no one is logged into the server, so you'll either need to add a step to the job to map it (not sure how well this will work,) use the UNC path (which may require changing privileges for your SQL_Services user,) or create a proxy account (bit of a pain.)