I'm moving your question to the AMD Manageability forum. The experts there should help you out.
I've also whitelisted you, so you can post future questions regarding DASH in the AMD Manageability forum.
As for Realtek systems available today, only digest authentication is support. AMPS (DASH Plugin for SCCM) can use digest authentication to manage DASH systems. AMPS user guide is available in the download package available here: www.amd.com/DASH
Please check this and let us know if it was helpful or not.