I have brooded babies in the house - and I built a brooder box that goes into the coop - the chicks stay locked in the box for a week or so inside the coop. The other chickens can come and go as they please.. after a week or so, I'll let the babies out during the day, and lock them back in the...
Are the new ones being picked on by the others? That might cause a problem.
Otherwise I don't know - mine have always gone in by themselves, but I've never changed coop or location.
Only one I had that didn't do it for a while was an injured hen who I kept in the house for a month, she...