Party's lookout is a little too good at being a lookout

Wondering how y'all would handle a PC in the game I'm running. Character is a Rogue, backstory is he was a scout in the army. Player commits to this, often offering to play lookout or recon an area. All good.

The complication arises when there's social investigation to be done. The party is currently in an urban area, so they're going around businesses, taverns, and other interior locations to get information. The scout always offers to play lookout and stays outside the building to watch for traps, ambushes, etc. I don't often have anything like this planned, so the scout ends up sidelined and doesn't get to enjoy the social roleplay, which the other players love because hey, funny voices.

I think the onus is on me to provide something for everyone, but I'm struggling to come up with ways to complicate my own plans and give the scout something to do while still leaving time for social. It also seems like the player is a bit bummed to miss out on the RP, but he's committed to the "my character was a scout, he would scout" mentality.

Anyway, any tips, rules of thumb for this? If the answer is just "practice your improv and DM skills," that's fine too 😅