When you have finished Freddy’s maintenance, you will be able to continue to this mission. Here you’ll need to find a Party Pass in Chica’s Room.
Five Nights At Freddy’s Security Breach – Party Pass: Find Party Pass in Chica’s Green Room
The first thing you will need to do is to enter Freddy, he will help you to get to Chica’s Room. On your right, you will see red stairs. Climb them and enter the door with the Chica symbol.
Continue down the hall and enter the elevator. Press the button here and the elevator will take you up.
Now enter Freddy again and enter the room in front of you where you will hear Foxy’s voice telling you “Get out of my room”.
Leave that room and go to Freddy’s room. There is a vent in Freddy’s backroom, enter the vent and the exit will lead you to Chica’s room.
When you enter Chica’s room, on the desk you will find a gift. Open it you will get the party pass.
That’s all you need to do. Pretty simple, right?.