1st world problem I know.
I've tried a few different frozen croissants and a range of settings on the air fryer (tiny Cosori 900W/2L) - I think an air fryer should be able to do a great job but I'm not happy with the results so far. No problem getting a nice flakey outside but the inside, even if it's hot, seems undercooked - I think there should be some squidginess to it but not as much as I am seeing. I can get the inside of a chocolate croissant somewhere near right only if I bite the end off to open it up and stick it back in. The pain au raisins are the worst - even cooking for say at 150C for 5mins then back in for 165 for 12 mins (i.e. in 2 stages) it still leaves them squidgy - I think they could taste more cooked. If you cook them too long the outside just gets darker and darker.
Have you worked out any general rules about how best to cook them? In 2 steps, at a lower temp, at a higher temp? They should cook quicker than a fan oven... or maybe they just don't excel in an air fryer.