Add the chicken broth, chicken tenders, carrots, celery, box of rice and the seasoning packet into the liner of your Instant Pot.`
Set your Instant Pot to pressure cook (manual) on High for 6 minutes with a 6 minute NPR, release the remaining pressure after the NPR.
Remove the chicken from the Instant Pot, set aside.
Add in the heavy cream, stir to combine. Press cancel on your Instant Pot and then press the saute button (at the middle setting).
While your Instant Pot is coming to a boil, combine the butter and flour until you create a thick paste.
Once the soup is simmering, add the paste to the soup, stirring until the paste has melted.
Allow the soup to simmer until it has thickened to your family's liking.
Chop the chicken tenders into small, bite sized pieces and stir into the soup.
Season with salt and pepper to taste. Enjoy!