Place eggs on a rack in Instant Pot with 1 cup water. Cook on high pressure for 4 minutes with natural pressure release. Remove eggs and let cool. Drain water.
Cut potatoes into large pieces. Place in Instant Pot with 1 cup water. Cook on high pressure for 5 minutes. Manual release pressure. Then potatoes should be el dente.
Slice eggs in half. Remove yolks into a separate bowl. Cut whites into bite size pieces.
To the yolks, add mayo, mustard, and relish. Stir until smooth.
Add potatoes and egg whites. Gently mix until combined.
Garnish with paprika and celery slices.