After reviewing all available replays and consulting with the Referee, the Situation Room confirmed the "no goal" call because the actions of Boston's Sean Kuraly impaired goaltender Buffalo's Linus Ullmark's ability to defend his goal.
Therefore, the original call stands- no goal Boston Bruins.
Since the Coach's Challenge did not result in the original call being overturned, the Boston Bruins forfeit their time-out.