If I'm remembering right, I think you can't go through the door until you unlock it from the other side. So you need to use the portal in the desert area first and go through the door that way, then you can freely use the door.
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If I'm remembering right, I think you can't go through the door until you unlock it from the other side. So you need to use the portal in the desert area first and go through the door that way, then you can freely use the door.