you must check if you have unity 2020.3.33f1.
if not, install it.
justapple
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i try this by muzzat plugin.
thanks
you plugin files are not the latest version.
com.apple.unityplugin.core-1.0.2.tgz
com.apple.unityplugin.gamecenter-1.0.3.tgz
these work fine.
com.apple.unityplugin.core-1.0.3.tgz
com.apple.unityplugin.gamecenter-1.0.4.tgz
these don't work