I started the Arms Delear strike from the EDZ map screen and have completed it several times in the past 24 hours. I have at not received the next quest step for the Legend of Acrius quest though. Video attached shows the quest on my inventory during the strike end screen. Note I am playing on Xbox One
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You need to actually load into the EDZ and run to the blue flag just inside the hangar bay of the ship to start the quest. You cannot complete it from the strikes nor form the strike icon from the map screen.