I have the same issue, seemingly, with my 2017 Outback. My battery kept dying for which I got a lot of run around from the dealer (gaslighting about keyless entry drains it if the key is too close to the car, etc.) Eventually I found a Reddit post about the DCM (Starlink) module, removed this fuse, and it hasn't died since. It sounds like it wakes up in the middle of the night to do something and thereby drains the battery, so whenever they test at the dealer for extra drain, they find nothing. Having that fuse out kills some speakers and the mic too, so it's a kind of annoying solution. I have not gone back to complain again recently though, so maybe they can do whatever it is they did for you. I saw some posts about wiring it to another circuit that's off when the car is off, but I am not confident doing that myself.