NieR Automata Resistance Missing Persons Mission Steps:

Talk to the three Resistance members in the treatment room of the Resistance camp. They said that one of the members was in The materials warehouse area is missing. That's their workplace. This mysterious disappearance is very worrying.

To complete this task, you need to complete "Side Task 11 Management Responsible Person" first. Then the responsible management personnel will ask 2B and others to investigate the material warehouse to obtain the whereabouts of the missing members.

Then go to the desert area to face the Level 35 robot. After the battle, you find that the missing member is dead and you can take the relics from him and then return to the infirmary of the resistance army to report.