Trying to book an award NYC-JNB. Going DL via ATL is 380K miles. I can find seats on AF EWR-CDG in business. I can see from the AF website that they have premium economy available CDG-JNB but not economy or business.

Called DL and was basically told that if AF had seats in economy or business than I could have it but they can't get me seats in premium economy. Is there any way to book this. I am happy to pay business and sit in premium economy but it seems as if that is not possible.