Thanks for reporting. I'm a bit confused though.
Results from https://www.ExpertFlyer.com
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Flight Timetables Search:
Search ATH to OTP on 14/04/23
Flight Stops Depart Arrive Aircraft Duration Frequency Effective Ending
A3 960 0 ATH 8:10 OTP 9:45 320 1 hr 35 mins M,W,Th,F,Sa,Su 26/03/23 01/06/23
A2 (A3) 9962 0 ATH 18:05 OTP 19:40 320 1 hr 35 mins T,W,Th,F,Sa,Su 26/03/23 30/04/23
RO 274 0 ATH 19:10 OTP 20:45 73H 1 hr 35 mins F 31/12/22 13/01/24
A3 962 0 ATH 21:20 OTP 22:55 320 1 hr 35 mins Daily 26/03/23 28/10/23
Are you saying that if you book A3 960 (not A2 9962) there will be no mileage earning? The flight number indicates that this would be a regular A3 flight with an added Animawings codeshare. This would/should normally earn miles.
I'd expect to not earn anything if you book an A2 AnimaWings flight, even if it was operated by A3 - or one of the A3 aircraft leased to AnimaWings.