Tascam 701-D HDMI Start Stop Trigger With Canon 5d Mark 4

Hello Everyone.

If I am using my Sony PXW-Z150, and Have the Camera HDMI To the Tascam HDMI IN, and From Tascam HDMI OUT to any Monitor, I can easily press Start Record and Stop Record from my Camcorder, and Therefore, Tascam Recorder Starts, and Stops Recording at the same time. This is a very good feature for syncing.

But, when I use my Canon 5d Mark 4, It does not work. I have contacted Tascam, and they told me that Canon 5d Mark 4 Is compatible, and it should work.

Any help Please

Thank you very much.

{Mod note: Moved to more appropriate forum}