Application Installation Failed - INSTALL_FAILED_VERIFICATION_FAILURE

Hi @Matthew Francis For the solution you need deselect Verify apps from your genymotion or device setting,

Settings -> Security -> Deselect Verify Apps.

Now then after try it work,

Open terminal, and type adb shell to access the emulator shell.

Type settings put global verifier_verify_adb_installs 0 on the shell.

I think this is related to the recent Google Play Services update. The verifier is more strict. This command in essence disables the Verify Apps option. From this article.