Yes @Andy1, you can cook a 2.2kg chicken confortaby in a 6l instant pot. The chicken will probably touch the sides unless you truss it up, but that doesn’t effect the cooking in any way. A 2.2kg seems to slot nicely into the pot you won’t need to use any effort to get it in…
here’s some pics. This chicken is a 2.2kg or an "extra large’ chicken in NZ
Prepped ready for sauté
In the pot before pressure cooking
Done! (And fall off the bone delicious)