Not every Avis rental is eligible and I could not not find anyone who could explain how they select it. I submitted 8-10 requests on avis.com but only 2 ended up posted. It took at least a month.

This is what avis website has to say on this topic

Please Note: Rewards program points will be awarded on eligible rentals. Miles may not be earned on corporate rates, discounts, free, tour or certain travel industry rates. The reward program members of Qantas, Air New Zealand Airpoints Dollars, and Fly Buys should contact their program website for their latest points totals.