I think the problem has resolved itself –
I just ended up creating an entirely new feed with the attributes I needed included at the start. I went to check back on my old feed today and it looks like the facebook_quantity_to_sell fields are now in the feed, is there possibly some lag between when new fields are added and when they show up in the actual feed? I did save and clear the cache and regenerate on my old feeds but the new fields weren’t there initially.
