Instant Pot Maple Mustard Chicken and Potatoes

spicy brown mustard, DIVIDED (I like to use my store's generic brand because it's less spicy than the name brands!)

+ 1 tsp pure maple syrup, DIVIDED

low sodium chicken broth or water

th tsp salt

yellow potatoes, chopped into 1-inch chunks

lbs boneless skinless chicken thighs, well trimmed

additional salt and pepper for seasoning chicken