Use a clean sealing ring in your instant pot
Sterilize the instant pot with 1 c water
Drain the water
Pour the milk into the instant pot insert container and secure the lid in place
Push the yogurt button + set to "boil". Then press start.
Once it is finished, read the temperature of the milk. If it's not at 180 degrees, then put on the sauté setting so the milk gets to 180 degrees.
Remove the insert container so the milk can cool to 110 degrees.
Add in the yogurt (plain, whole milk yogurt with live active cultures).
Stir until the yogurt is fully combined with the milk.
Place the insert container back in the instant pot, and set the yogurt button to 8 hours (you can do more if desired - I just do 8).
Secure the lid in place and press start. (it will not seal during this process - but don't open it up)
After 8 hours at the yogurt setting, the yogurt should be slightly set, and a watery jelly-like consistency.
Pour directly into the strainer, and then place in the refrigerator overnight to drain.