I've made acorn squash in my Instant Pot several times now. It is sooo good and so easy.
I made a YouTube to show you how to do it. I'm showing 1 acorn squash, but I have done 2 and think 3 might work as well. Also I'm planning on trying this method out with a butternut squash that I have. I'm guessing the time should about the same, but I will find out.. :)
Hope you have a chance to try some yummy winter squash!