Commenting because there have been a lot of people having this issue. When you enter the human home with all the knick-knacks and travel to the right. You will eventually find a blue button. You can pick this up and bring it back home with you. If you leave the human home without this blue button, you won't be able to progress. I didn't consider people leaving the human home without ever having picked up the button so this is on me.
You pick things up with shift.