my understanding is that M cars that have their BIS after 2000 miles can't be certified , but I have never heard that warranty denied for delaying that service
though having done multiple M school over the years and talked to multiple instructors and mechanics, they always do the break in service before they put the car in service for the school, so it seems BMW sticks to that religiously as it cost them money to run these cars for 1200 miles before using them
hope your case will be resolved promptly
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