No reason why it shouldn't be accepted. I hope you reported it.
Although, oho isn't 'wow' and definitely not "oh wow", so I reported that. Alone like that it's more like 'oops'. We have vau (or the more colloquial vautsi) for that, and "oh wow" could be e.g. "oi, vau"; "ai vautsi"; "oho, vau"; or even "vautsi-vau".