Is it just a microwave, or is it a combo micro and convection oven? I don't know if those even exist, but I don't see how a microwave is going to put a char on the outside of a steak without drying the inside of it.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw