To make the pickled red onions, whisk together apple cider vinegar, sugar, and salt in a small bowl. Add sliced onions to a mason jar or airtight container. Pour over vinegar mixture and seal. Let sit at room termpature for at least one hour. Store in the refrigerator for up to 2 weeks.
Add chicken, chipotles, adobo sauce, honey, onion powder, garlic powder, salt, and cumin to the Instant Pot. Stir to combined and cover. Set to Manual and cook on high pressure for 13 minutes. Release pressure manually.
Remove chicken to a cutting board and shred using two forks. Add the chicken back to the Instant Pot, along with black beans and lime juice. Stir to combine.
eServe chicken in tortillas with pickled onion, jalapeño slices, sour cream, and cilantro.