I have a Magic Chef in-wall oven, stove is separate by the way. The oven is gas. I was told it has no pilot light by some "help" person on another site. Is there a pilot light on all gas ovens? If so, where is it? Afraid to turn on knob to light along with a match. lol
According to online documentation, this model uses a glow bar. For an oven (not a stove top) one should NOT have to press any button to get anything to ignite - the thermostat and circuitry will take care of that for you, provided everything is intact and working.
If it were my oven, I'd open the door, remove the lower metal cover from within the oven (removing the grates first if necessary) and watch what happens when you turn the oven on. With glow bar designs, for safety reasons, the gas valve may not even open if the glow bar has failed (when it generally becomes an open circuit).
In my experience, glow bars are not very reliable and yours may have failed "open".
Looking line I only saw models with a pilot , I tried looking for spark and hot surface ignitors but did not find any thing other than the standing pilot for your model. The instructions say remove the broiler carriage , turn the thermostat past 140 hold a match at the top forward section of the pilot after the pilot lights the burner will light in 30 to 60 seconds, replace broiler carriage.
Not all ovens use piezo-electric, the Kenmore gas range/oven that my wife put in her rental apartment some time ago had a high temperature "glow" element. It was basically a heating element that turned on when you first started the oven, and was hot enough to light the gas.
We had Sears service replace the unit several times because it would burn out. (an the installers would screw it up)