Flatpack food
When you’re installing a new kitchen you really need to think about how the different appliances, cupboards, and features will work in practice. Sure, it all looks nice there up on the wall, but can you use it in the way it was intended to be used? Can you, for example, actually get the food into the microwave?
In this case, unless you’re microwaving really thin pizzas that you can turn on their side without all the toppings falling off, then no you can’t. It’s obvious that the landlords didn’t check before installation. This appliance is totally useless and really needs replacing.