We have recently moved from Android Studio to Xamarin and have setup an Aplha release for the Xamarin version within the existing app in the Google Play store. However when we come to update the app via the store on our test devices we get the error "XXX can't be installed (Error code: -504)" and the app is not updated.
I've tried some of the workarounds when this error occurs for other apps but they don't seem to work. If we completely uninstall the app and then re-install it (via the Play Store), the app installs without an issue.
Any advice would be appreciated.