In the Android APP it would be necessary to increase the synchronization rate for newly created appointments. Eight hours is too long, and "Immediately" only works in the direction APP -> Exchange but not vice versa. A synchronization rate of 15 min would be perfect for me.
Then, when I confirm an appointment at work, I don't have to remember to open OneCalendar on my smartphone for synchronization every time.
Maybe interesting in connection with the suggestion: "display events even if I haven't yet accepted them". But I don't know if the appointment invitation is already in the Exchange calendar.