How can employees enter international zones?

Hi, this is just a little test airport to test some aspects of the game and for the first time I’m actually using international zones but somehow my employees can’t enter it. What do they need to enter international zones?

Employees don’t care about internation vs. not international. They can go in between them without any checkpoint. Just and a door on the wall in between secure and international and zone it staff only. The staff will use that door. Remember to do it next to the exit to

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