At 8:11 of the third period in the Capitals/Maple Leafs game, Washington requested a Coach's Challenge to review the "Interference on the Goalkeeper" decision that resulted in a "no goal" call.
After reviewing all available replays and consulting with NHL Hockey Operations staff, the Referee determined that Washington's Nicklas Backstrom interfered with Toronto goaltender Frederik Andersen.

Therefore the original call stands - no goal Washington Capitals.
Since the Coach's Challenge did not result in the original call being overturned, the Capitals forfeit their time-out.