Could try to put the bp in a container, put holes in the lid & introduce the mouse that way.

I would add the mouse in first, set the container inside the home, where it could get warm, then add the bp.

Also could be that your bp is still not settled in... have you handled your bp before you tried feeding it? sometimes that will do it, where they won't eat. Maybe there is others who can suggest other things.

But this is what I have tried, i fed my bp that way for the first 1.5 months. Now I just put the thawed mouse/rat inside his enclosure & leave him alone & he will come to it & eat it. good luck