Drain sauerkraut in a colander placed in the sink. If your sauerkraut doesn't seem that chopped up, I used kitchen shears to chop it up a bit more.
Cut up the corned beef into medium-sized cubes (or smaller if you prefer.)
Set Instant Pot to SAUTE, MEDIUM HEAT.
Heat the olive oil, then add the chopped onion and cook about 4-5 minutes; add minced garlic and cook 2-3 minutes more.
Then add chicken broth, beef broth, dried thyme, diced tomatoes with juice, drained sauerkraut, diced corned beef, Worcestershire Sauce, bay leaves, and chopped parsley.
Set Instant Pot to MANUAL, HIGH PRESSURE, 5 minutes.
When the cooking time is up, let the Instant Pot NATURAL RELEASE for 10 minutes; then release the rest of the pressure.
Stir in balsamic vinegar and Monkfruit sweetener, season to taste with lots of fresh ground black pepper and serve hot.
We ate it with coarsely-grated Parmesan Cheese sprinkled on top and a drizzle of extra balsamic vinegar.