When cooking Instant Pot Chicken in an Instant Pot it takes around 12 to 15 minutes on high.
Larger chicken breasts may take 15 to 20 minutes to cook in the Instant Pot but most chicken is fully cooked in the Instant Pot after 12 to 14 minutes.
It's best to thaw out the chicken first before cooking the chicken in the instant pot but you can place the chicken when frozen in the instant pot and it will cook.
It takes about the same amount of time to cook frozen chicken in the instant pot as it does thawed out chicken but I prefer to thaw my chicken first and then put it in the instant pot.
In the instant pot cook the chicken on high for 15 minutes and then after 15 minutes release the pressure and the chicken should be fully cooked.