Did you guys deviate from the drone/looted Delamains office when you started his questline? I did that and those quests got buggy, i couldn't answer the phone when he called about the missing cabs. After some YT search i got an advice which worked.
When you start Delemains quest, just follow the drone, don't deviate from it, don't loot the place. Just follow his instructions.
I lost 3 hours of gameplay, because i had to reload the game to the point just before i entered Delamains office, but all his quests went just fine, no problems at all.
Also, i did all his quests without any quicktravel/reloading/quitting the game, i have read all unread messages in the communicator (read those tips under some YT materials). But probably not looting the place and following the drone was enough to finish his quests without any issues.
When you start Delemains quest, just follow the drone, don't deviate from it, don't loot the place. Just follow his instructions.
I lost 3 hours of gameplay, because i had to reload the game to the point just before i entered Delamains office, but all his quests went just fine, no problems at all.
Also, i did all his quests without any quicktravel/reloading/quitting the game, i have read all unread messages in the communicator (read those tips under some YT materials). But probably not looting the place and following the drone was enough to finish his quests without any issues.