I had exactly the same thing happen to me last week while in KL, i used the first QR code/Thai pass they sent and brought the second with me in my bag in case they asked. They never asked and i entered without any problems. I also loaded just my CDC card from when i got my J & J shot in Houston
I bought AXA and my circumstances changed and i could not travel. They wont refund if you cancel, they will only allow you to move dates. I have bought Tune also and they could not be more helpful and refunds are easy with them.
Stay away from AXA, they wont give you a refund if you need to cancel the policy. Tune do give refunds if you need to cancel anytime. With AXA you can only move dates.