Add broth, olive oil, vinegar, and seasonings to the the pot. Stir to combine.
Place chicken in the liquid and turn to coat. Place trivet in the pot over the chicken.
Pierce scrubbed potatoes with a fork and arrange on the trivet.
Seal lid and cook on Manual setting for 13 minutes.
Let pot depressurize for 5 minutes and manually release remaining pressure.
Remove potatoes and set aside.
Remove chicken and shred. Pour 1/4 cup of the cooking liquid over chicken and toss.
Slice open baked potatoes and serve topped with a generous portion of the chicken and drizzle of ranch dressing.