After broke my head a little, I finally made to work the Motokey for Moto x4 to work on our device.

Just follow this guide and be happy.
1 - Download this file and file two XML files and place on system/etc/permissions and set permissions to 644

2 - download and extract the MotoKeySystemSupport.zip and place in system/priv-app and set permissions to 644 for files APK, odex and vodex
3 - download and extract the MotoKey.zip and place in system/priv-app and set permissions to 644 for files APK, odex and vodex

4 - reboot and be happy.

Just follow this guide and be happy.
1 - Download this file and file two XML files and place on system/etc/permissions and set permissions to 644

2 - download and extract the MotoKeySystemSupport.zip and place in system/priv-app and set permissions to 644 for files APK, odex and vodex
3 - download and extract the MotoKey.zip and place in system/priv-app and set permissions to 644 for files APK, odex and vodex

4 - reboot and be happy.
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