Why is my Instant Pot corned beef tough?
If your Instant Pot corned beef is tough, it's probably because it was not pressure-cooked long enough. Usually, 90 minutes of pressure cooking time does the trick. But, if it's tough, it needs to cook longer. You can just put it back in the Instant Pot and cook for another 20 or 30 minutes. Make sure to naturally release the pressure before opening the Instant Pot.