Invalid value 'armeabi' in $(AndroidSupportedAbis). This ABI is no longer supported. Xamarin.Forms - VS2019

armeabi is deprecated and your Android project should target armeabi-v7a and arm64-v8a at a minimum in your release builds destined for the Play Store.

You can directly edit your .csproj and remove the armeabi from within the AndroidSupportedAbis tags:

<AndroidSupportedAbis>armeabi-v7a;arm64-v8a</AndroidSupportedAbis>

Or you can open the Android Build settings in the IDE and it will auto-update it for you:

• Targeting 64 bit architectures on Xamarin Android

It can be adjusted in 3 steps.

Step 1 - Right-click on Android Project and Click Properties:

Step 2 to 4:

Step 5 - Uncheck armeabi: