Sorry to hear that your new toy won't play.

Is the bike a fresh import? It may be a case of cleaning out and setting up the carbs after months sitting full of stale fuel, but you would expect a reputable dealer to take care of all that for you before handover.

If it were me, I'd be going through all the normal steps - Is the non firing plug wet with fuel? Have you changed the plugs? Have you had the carbs off and cleaned them out? Once you've checked and ruled out basic fuel and ignition issues, a compression test and a leakdown test would be next in that order.

Hope you get it sorted quickly.