The fact it was the same brightness from horizon to horizon and that it was seen at 2200 rules out a satellite.
Why does that rule out a satellite? The only reason why 'satellites' seem to change in brightness is due to them not really being a satellite but things like spent rocket stages tumbling in orbit, hence reflecting sunlight as it tumbles.
It could be that this satellite isn't tumbling...
Also another phenomenon called Iridium flares show that you can see satellites in bright daylight....