What is my android package name?

I am developing a Forms app and would like to implement maps into my application.

I have already tested my functionality with Windows Phone and iOS, but I am not sure what my package name is for android.

Going into ProjectName.Driod->Properties->AndroidManifest.xml, all I see is this with no package name.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-sdk android:minSdkVersion="19" />
    <application></application>
</manifest>

If i do not assign an sha1 fingerprint and package name to the google console credentials, the android application will work, but I cannot seem to get the package name right and only get a grey screen when I provide a package name.

Where can I find my package name?