Hi, as others have previously stated, only Avios redemptions with the IB, YW, I2 and BA flight codes can be refunded. As far as I know, award flights on AA are always booked with AA flight numbers, I've never seen any IB award seats on AA being offered as codeshares with an IB flight number.

Regardless, you should still be entitled to having those Avios refunded pursuant to Iberia's own Covid-19 rules on flight bookings. To wit:

How can I change or get a refund for tickets purchased with Avios?
If you bought your ticket with Avios or Avios&Money, please request a change or refund through the Call Centre or by filling in the Iberia Plus help form. If you request a refund, we'll credit the Avios to your Iberia Plus account and refund the taxes to the payment card you used to buy your ticket. This is a manual process so it may take us a little longer to confirm your request. Thank you in advance for your patience. If you used your Avios to get a discount on the price of your ticket, we will refund the entire amount by means of a voucher through Manage Your Booking.

https://www.iberia.com/it/en/covid-19/faqs/

There is no exemption to the above rule for Avios redemptions with AA flight numbers, so you should be entitled to a refund for Covid-related reasons.

I suggest that you succinctly make your case with Iberia through this form (https://contacto.iberia.com/?aWRpb21hPUVO), clearly stating that Covid was the sole reason for your cancellation, hence you are entitled to a full refund, irrespective of the fact that the flights were operated by AA.

If you don't hear back from them within a few weeks, I suggest you send them a paper letter by registered mail. As a last resort, you could consider suing them in small-claims court in the US.