In a measuring cup or small bowl, whisk together broth (or water), coconut aminos (or soy sauce), rice vinegar, fish sauce, maple syrup, sriracha (if using), sesame oil, and minced garlic until combined.
Place the raw chicken thighs in a resealable plastic bag or airtight container and pour in the marinade. Seal and refrigerate for at least 15 minutes, or up to 1–24 hours for more flavor.
Plug in the Instant Pot and transfer the marinated chicken and all marinade to the inner pot. The thighs can overlap and do not need a single layer.
Close the lid and set the valve to sealing. Pressure cook on High for 8 minutes for boneless thighs (10 minutes for bone-in, 14 minutes for frozen thighs). Allow the cooker 5–10 minutes to come to pressure first.
When the cook time finishes, perform a quick release to vent the pressure. Carefully remove the lid.
Check doneness by inserting a meat thermometer into the thickest part of the largest thigh; the internal temperature should read at least 165°F (74°C).
Use tongs to transfer the chicken to a plate, leaving the cooking juices in the pot.
If you want a thicker sauce, sprinkle the tapioca flour or cornstarch into the pot and press Sauté. Whisk or stir constantly until the mixture comes to a boil and thickens, about 3–5 minutes.
Return the chicken to the pot to coat with the sauce, or spoon the sauce over the chicken to serve.