Why did thomas and Teresa need to be the ones who tried to punch in the code?

Thomas and Teresa needed to be the ones to punch in the code because they shared a unique connection and understanding of the situation, having both been deeply involved in the events leading to their predicament. Their experiences in the maze and the challenges they faced together gave them insights that others lacked. Additionally, their bond allowed them to communicate and coordinate effectively under pressure, making them the ideal candidates to attempt entering the code.