Thank you for your message.
Since recently Microsoft requires additional signing called "attestation signing". This is in fact double signature - Microsoft's signature is applied on top of our signature.
We went through this procedure in the Microsoft Development Center and had our driver approved/signed, but this update will be available with 18.104.22.168 beta 2 release.
Important note from Microsoft website
An attestation signed driver will only work for Windows 10. It will not work for other versions of Windows, such as Windows Server 2016,Windows 8.1, or Windows 7.