Add 1 tbsp avocado oil to the insert of the Instant Pot and press the saute button. When hot, add the sliced sausage in a single layer and saute for 5-7 minutes, stirring occasionally, until browned on both sides. Use a slotted spoon to remove the sausage from the Instant Pot and place in a medium bowl.
Add the potatoes, onion, and garlic to the Instant Pot with a splash of chicken broth. Saute for 5 minutes, scraping the bottom of the Instant Pot to remove the stuck sausage pieces from the bottom. Press the Cancel button. Add the browned chicken sausage back to the pot.
Add the rest of the chicken broth, chicken thighs, spices, salt, pepper, and lemon juice. Secure the lid on the Instant Pot. Check to be sure the valve is set to "sealing." Press the Pressure Cook button and adjust the time to 15 minutes to cook on high pressure.
When the Instant Pot indicates it is done pressure cooking, move the valve from "sealing" to "venting." When the pressure indicator button drops, carefully remove the lid from the Instant Pot. Take out the chicken thighs and place on a plate. Shred with two forks and add back into the soup. Stir to combine. Ladle into bowls, serve hot, and enjoy!