Start by patting the whole chicken dry with paper towels. Season the inside of the chicken with salt and pepper, and then stuff it with the quartered lemon and whole garlic cloves.
In a small bowl, combine the olive oil, paprika, Italian seasoning, celery flakes, minced garlic, salt, and black pepper. Mix well to create a paste-like consistency.
Rub the seasoning mixture all over the chicken, making sure to cover every inch, including under the skin where possible.
Pour the 1.5 cups of water or chicken broth into the Instant Pot.
Place the seasoned chicken on the trivet inside the Instant Pot. Secure the lid and set the valve to the sealing position. Cook on high pressure for 6 minutes per pound, which for a 4.4 lb chicken is about 26 minutes.
Once the cooking time is complete, allow for a natural pressure release for about 15 minutes, then carefully switch the valve to venting to release any remaining pressure.
If you prefer crispy skin, transfer the chicken to a baking sheet and broil it in the oven for 5-7 minutes until golden and crispy.
Let the chicken rest for about 10 minutes before carving. Enjoy it with your favorite sides!