I have used release mode and debug mode too with Xamarin.forms:
Build-> Archive for Publishing wizard.
After publishing, I selected Ad Hoc and saved the APK to my local drive.
I have min SDK version API level 15 (4.0.3) with target API 23, I have required permission.
I have selected all items from list on Suported ABIs (armeabi, armeabi-v7a, x86, x86_64 and arm64-v8a)
I test with my Nexus 5 with 6.0.1 but I send APK
Always show same error...
(Spanish) Error de análisis
se ha producido un error al analizar el paquete
(English) Parse error
There was a problem parsing the package
I have tested with my custom application and I have generated a sample APK for this library