Hey Jean,
Thanks for letting me know about that info, when I removed the Unity Ads package it all seems to work
@tyrot
You need to download the Unity Ad scripts from the ecosystem,
Make sure you use the Initialize action at the start of the scene.
Then use the Show Ad action, this action has 3 outcomes ad failed, ad closed & ad skipped. If you want to reward the user, the outcome must be ad closed.
Search the forums, someone posted a screenshot of it.