Following bc I’m in the same-ish boat….having potty time issues too.
My cousin took her daughter to a child psychologist to help with this issue and it worked.
Hat kind of toilet are you putting him on? Maybe get him something else? Have you tried reading to him? Maybe do like little toilet dances to help get the gut moving along?
Privacy. Take out all bath mats in the bathroom, put the potty in the center, tell your lo to poop and you’ll be back later. Close the door and give him a few mins or maybe longer. It works!
This is super common! I've heard to give them a drink with a straw and let them blow bubbles, I can't remember the science behind it but it helps relax those muscles or something!