I need help (spoiler probably)

I am stuck on the Prize Counter mission: objective survive until Freddy shuts down the alarm. The problem is that I already have survived that. I took the security badge, survived, and it still says the same thing. I can go to the fire exit but nothing happens. When I leave the prize counter place and call for Freddy I can’t even enter him. I’m completely stuck. Any suggestions would be appreciated thanks.