Unfortunately, I don't have a solution for you but I am also experiencing the same issue. However, in my case, I'm still trying to get SCS 8 and version 1 of the add-on, but my vPro enabled clients are still showing up with a status of "Detected" in SCCM console.
A computer showing up as "Detected" means SCCM doesn't have access to AMT. Please verify that the Primary Site Server machine account is listed in the ACL section of your SCS profile.
I can confirm that the site Server is in the acl Group. The strange Thing will be that These machines were already working with the old method which is implemented in the SCCM Server. I could wake up These devices and deploy Windows 7 onto them. And also all the Groups which are implemented by the plug-in are strange. Devices which are "Externally Provisioned" and working appear in the device Group "Intel AMT Systems not configured"
Up to now my hope is that Microsoft will face the Problem and implement the new api in an upcoming service pack of SCCM.
The "Intel AMT Systems not configured" collection is based on custom inventory data and not the native SCCM status. After a hardware inventory cycle they should fall into the correct collection.