How would you handle our team dynamic?

I don't know how to describe it other than a team dynamic sort-of issue. I work on a 10 person sysadmin team that's part of a much larger IT structure. My job is kind of a unicorn, we're a 100% remote, mostly 9-5 shop with nights only ever coming in if we're doing a project where work nights are scheduled well ahead of time. Otherwise once we're out for the day we're out-out, I'll get back to you at the start of business tomorrow.

The issue is we absorbed a sysadmin from another team whose regular hours are overnight. They were allowed to keep those hours but it's turned into a nightmare trying to work with them on anything. There's zero possibility of a face-to-face conversation. Text conversations have 12 hour gaps between my reply and their reply. I know my coworkers are frustrated as well (not directly complaining but offhand comments about being difficult to communicate things).

My most recent issue is trying to explain to them that something isn't within my power to do and I don't know whose power it is. I have two options: do the groundwork for them, find who does have the power to fix it, and ask them to OR I could leave it as is and have them flounder about how to get their thing done because they don't share working hours with any of the people involved. I want to do the ladder but it feels overly vindictive. But at the same time it's not my fucking job to baby someone that wants to work a different shift. I would not be doing option one for a coworker working normal hours because they're more than capable of finding out who they need to talk to. I'm also half-hoping it forces a change in their working hours because it would simplify everyone else's life.

Anyone else ever run into this kind of dynamic? I know it's weird to begin with that we don't usually have 24hr staffing to begin with.