There are plenty of bots and scammers messaging desperate people on this sub selling them overpriced tickets for the bus and disappearing.

If you need a bus from DUBAI to OMAN, you can book it yourself from dubai airport Terminal 2 departure

There are 3 buses that depart from Dubai Airport to Muscat at 07:45 am, at 03:45 pm, and at 11:15 pm

The fare is 55 AED only. don't get scammed