Got Avalonia.Ui working.

Gamenight.Ui/Gamenight.Ui.Android/Gamenight.Ui.Android.csproj

@@ -4,7 +4,7 @@
     <TargetFramework>net9.0-android</TargetFramework>
     <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
     <Nullable>enable</Nullable>
-    <ApplicationId>com.CompanyName.gamenight.ui</ApplicationId>
+    <ApplicationId>com.CompanyName.Gamenight.Ui</ApplicationId>
     <ApplicationVersion>1</ApplicationVersion>
     <ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
     <AndroidPackageFormat>apk</AndroidPackageFormat>
@@ -23,6 +23,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\gamenight.ui\gamenight.ui.csproj" />
+    <ProjectReference Include="..\Gamenight.Ui\Gamenight.Ui.csproj" />
   </ItemGroup>
 </Project>

Gamenight.Ui/Gamenight.Ui.Android/MainActivity.cs

@@ -3,10 +3,10 @@ using Android.Content.PM;
 using Avalonia;
 using Avalonia.Android;
 
-namespace gamenight.ui.Android;
+namespace Gamenight.Ui.Android;
 
 [Activity(
-    Label = "gamenight.ui.Android",
+    Label = "Gamenight.Ui.Android",
     Theme = "@style/MyTheme.NoActionBar",
     Icon = "@drawable/icon",
     MainLauncher = true,

Gamenight.Ui/Gamenight.Ui.Android/Properties/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:installLocation="auto">
 	<uses-permission android:name="android.permission.INTERNET" />
-	<application android:label="gamenight.ui" android:icon="@drawable/Icon" />
+	<application android:label="Gamenight.Ui" android:icon="@drawable/Icon" />
 </manifest>