Unable to write into VANC space with Ultrastudio SDI USB3

I am using an UltraStudio SDI USB 3.0 device and so far I've been able to read/playback video as well as read metadata in VANC using the SDK. Now I am trying to write metadata into the VANC and I am not seeing anything on my Phabrix SX video analyzer. I'm using 10.5.4 version of the desktop software on Windows 7 SP1. I've tried running the VancOutput and RP188VitcOutput binaries supplied with the SDK as well are recompiling them under VS2012 and I get nothing in the VANC. How can I get metadata into the VANC?

Hi Steve,

just found your topic from 2016 because i'm doing research about VANC data myself...
Did you find out more?
Would be interested to know how you read the VANC metadata with the SDK....
Regards!