I seem to be knocking my head against a wall trying to get com.unity.services.mediation working on a device. I've tried multiple different versions of the editor, each one seems to have a unique reason of why it doesn't work? What version of unity editor did you use and which package version did you use? And did your player preferences look like this? Also were you able to run ads in test mode on a device and were you able to monetize in production without issues? I've seen issues from incorrect java shipped, to game id not recognized, random issues with the android resolver just throwing exceptions with no indication of what the issue is and build stalling. I just want to know what the happy path is.