Place 2.5 cups of water in your 6qt instant pot
Cut corned beef into two smaller pieces and then wash off your corned beef with water
Place meat rack on top of the water, then place corned beef on meat rack in your Instant Pot
Use the seasoning packet that comes with your corned beef to sprinkle all over the corned beef and in between the two pieces
Pour the lager over the corned beef
Add pickling spice on top
Seal your instant pot and cook at high pressure for 90 minutes
Let your Instant Pot do a natural release for 20 minutes, and then do a manual release
Remove corned beef from Instant Pot, let cool a little, cut against the grain, and serve