At 1:19 of the third period in the Oilers/Predators game, Edmonton requested a Coach's Challenge to review whether Nashville's Viktor Arvidsson was off-side prior to his goal.
Review was not conclusive in determining whether Nashville was off-side prior to the goal, as Arvidsson was never in off-side position when the puck entered the attacking zone. According to Rule 78.7, "If a review is not conclusive and/or there is any doubt whatsoever as to whether the call on the ice was correct, the On-Ice Official(s) will be instructed to confirm their original call."
Therefore the original call stands - good goal Nashville Predators.
Since the Coach's Challenge did not result in the original call being overturned, the Edmonton Oilers forfeit their time-out.