At 18:58 of the second period in the Avalanche/Flames game, Colorado requested a Coach's Challenge to review whether Calgary's Matthew Tkachuk interfered with goaltender Philipp Grubauer prior to his goal.
After reviewing all available replays and consulting with the Referees, the Situation Room determined that the actions of Colorado's Erik Johnson caused Tkachuk to make incidental contact with Grubauer before the puck crossed the goal line. The decision was made in accordance with Note 2 of Rule 78.7 (ii) which states, in part, that the goal should be allowed because "the attacking Player was pushed, shoved or fouled by a defending Player causing the attacking Player to come into contact with the goalkeeper."
Therefore the original call stands - good goal Calgary Flames.
Since the Coach's Challenge did not result in the original call being overturned, the Colorado Avalanche forfeit their time-out.