How to do something when a rewarded video is closed before the end in Google Admob

Hello, I am currently implementing Google Admob in my Unity game. I have done a “watch a video to gain an extra life” system. It works, but I would like the Game Over screen to show intantly if the user closes the rewarded video before it ends ( there is a timer to click on the button to show the video, and the game over screen pop up at the end of this timer).
I have already tried to use the OnAdClosed event, but it doesn’t seem to work.
Can someone please help me ?
Thanks !

I believe a simple boolean variable would suffice that could be set to true on “OnUserEarnedReward” event and then can be checked in “OnAdClosed” event accordingly. Well that’s what I did anyway. Guess how I got to this post?