There’s a door here, or an open window to the right, which leads into a room with a makeshift smoking contest machine.
First up, leave the smoking contest machine as it is, then return to Updaam in the afternoon.
Inside this building, you’ll find a note containing the second Pact of Smoke door code from a different Eternalist that now survived the smoking contest.
Inside, in the glow of the wall of TVs, you’ll find the final note and the last Pact of Smoke door code.