To grant access to usage history:
1. Enter the admin panel on the device: tap and hold the key icon, then enter the admin password
2. Click "Check permissions"
3. Click "Back".
The device should ask you to grant access to usage history. It will open the appropriate Android settings screen, where you can grant the permission.
Notice that settings will be unlocked 3 minutes after that. To test access denial, wait 3 minutes or reboot the device.