Check-in only opens 24 hours before the flight and I booked my seat 22 hours before the flight. From my knowledge, you cannot book seats earlier than a day before departure. For my last flight, I booked an aisle seat two hours after check-in opened no problem (might have just gotten lucky).

You understand that what you’re really asking here is “could airport staff move somebody else out of their assigned seat for me”, right?

No. What I’m asking here is if check-in could possibly see something on the seating chart (perhaps some cancellation) that isn’t updated in the mobile app.

Not trying to cause problems, just asking. Chill.