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got this same error in unity version 2021.1.12f1 and after opening the source.properties file at default install location it has the wrong pkg...
resolved this by disabling windows defender firewall
im getting this error for tpay mobile store as well. are there any logs on this to be able to troubleshoot why the packing failed?
your keys come from the File -> Player Settings -> Publishing area if you had already set up your app for google play encryption