When setting up leaderboards/achievements which reference name do you use for the iOS leaderboards?

I have created an android/iOS game and setup leaderboards on both platforms.
They are all live but the iOS leaderboards and achievements are currently not receiving any scores and achievements progress is not getting made. I am just wanting to confirm which “Name” should be used when setting up the leaderboards and achievements in the editor for iOS.

The Reference Name or the Achievement/Leaderboard ID?

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