Add chicken broth through pumpkin puree for the curry to the insert of the Instant Pot. Whisk the mixture together until smooth.
Nestle chicken into the pot, submerging the pieces as much as possible.
Seal and cook on manual high pressure for 15 minutes. Let pressure naturally release for 10 minutes, then manually release any remaining pressure.
Remove chicken from the Instant Pot to a cutting board. Chop the chicken into bite-sized pieces. You can also shred it if you prefer.
Return chicken to the pot with bell peppers. Set Instant Pot to Saute and cook, stirring often, until peppers have softened, about 5 minutes.
Stir in lime juice.
Serve warm over rice with naan, freshly chopped cilantro, and lime wedges.