Hi, my apologies for the delay in response, though I have been working on this. What I have found so far is that it's EITHER OR, for some of the vPro functions, like...either MACSec is enabled and AMT is disabled for MACSec to work or vice-versa. I'm still digging and haven't found any documentation that lists ALL Intel NIC's with MACSec + vPro. Hope to have more info by end of week.
The information I received is that MACsec is IEEE 802.1AE standard and it is Ethernet device feature. It is not compatible with all vPro/ AMT technology.