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If there is a task on the level it can be three things. 1. destroy mission objects marked in red on the map. 2. get the keycard. 3. accompany the npc to his designated place to get a keycard.

 Based on the screenshot you missed the 3rd :/

Sorry, it was a design error that slipped in due to the constant redesign. The map was wrong and the NPC had no exit. It has been fixed. Now: The map indicates 19 destroyable mission objectives and the NPC must also be escorted to his own exit, there he will give you a key and the exit will be open. Fixed version is uploaded.