You need to mix vinegar with lots of water. Otherwise, it may explode and damage parts.
https://cooking.stackexchange.com/questions/96621/mircowave-does-not-work-after-i-used-vinegar-without-water-to-clean-it
https://cooking.stackexchange.com/questions/82218/microwave-door-blew-open-when-boiling-water-vinegar-mixture-for-cleaning