When creating UWP builds for xbox one and Unity 2019.3, is the process still the same as it was with U2019.1? Does it still use the now somewhat old xbox live 1804 QFE 2 Release plug-in from Microsoft?
Nothing really changed. I don't know whether that Unity plugin is being maintained though - if it doesn't work for you, you might have to call into Xbox Live API directly through this package: https://www.nuget.org/packages/Microsoft.Xbox.Live.SDK.WinRT.UWP/