For the T2, T3 and T4 missions you have to actually pick up the mission from a civilian stood next to the transporter. I'm assuming it will be the same for the T5 mission.
The T1 / Warehouse mission is slightly different in that the mission giver is stood next to the warehouse and is more obvious.
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For the T2, T3 and T4 missions you have to actually pick up the mission from a civilian stood next to the transporter. I'm assuming it will be the same for the T5 mission.
The T1 / Warehouse mission is slightly different in that the mission giver is stood next to the warehouse and is more obvious.