apk generated from xamarin doesn't work i have an error: app not installed

bilel miled 21 Reputation points
2021-01-18T11:53:37.007+00:00

Hello ,
i am doing an app with xamarin with a map , i have followed these steps :setup

when i generated the apk following these steps :release-prep

by the apk i couldn't install the app from the apk and when i run the app from the visual studio it works well .
i need help please.

Xamarin
Xamarin
A Microsoft open-source app platform for building Android and iOS apps with .NET and C#.
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