It’s a POS ikea convection/microwave combo thing. The convection mode maxes out at 250 °C, which is pathetic, but for pizza I put a sheet pan in the middle and blast the grill mode which uses a heating element in the top of the oven.
This halves the volume of the oven, and the grill mode doesn’t take a temperature, just one of three heat settings.
So I set it to MAX and let it preheat for a bit, and the result is pretty good.