Follow these steps exactly for a foolproof dish.
Pour 1. 5 cups (12 fl oz / 355g) water into the Instant Pot and insert a steamer basket.
Place the 6 eggs (10. 5 oz / 300g) and 3 lbs (48 oz / 1360g) of cubed red potatoes in the basket.
Select MANUAL and cook at HIGH pressure for 5 minutes.
When the timer goes off, use a Quick Release to vent the steam. Carefully open the lid.
Transfer the eggs to a bowl of cold water using tongs or a slotted spoon. Wait 2-3 minutes for them to cool.
In a large mixing bowl, combine the cooked red potatoes, 2 cups (16 oz / 450g) mayonnaise, 0. 5 lbs (8 oz / 225g) cooked bacon, 2 chopped celery stalks (3 oz / 85g), and 1 bunch of chopped green onions (3. 5 oz / 100g).
Peel the cooled eggs, chop them, and add them to the salad.
Stir everything together gently but thoroughly.
Season the mixture with 1 tsp (0. 1 oz / 5g) salt and 0. 5 tsp (0. 1 oz / 2. 5g) ground black pepper.
Stir well to ensure the seasoning is evenly distributed, then serve.