No — no metal utensils cookware or dishes with metal coating allowed to be used in a microwave. In case you run the microwave with the metal inside, at least you will see sparks, sometimes flames. Finally, it can cause damage to your microwave and be the reason for an open fire.
Metal microwave crispers have a unique construction, so they are safe to use in a microwave. We recommend checking that the dishes which you are planning to use in a microwave have corresponding marking at the bottom.