I'll answer my own issue. After some more experimentation I found that the "Video Mode" must be set to "Day Mode" to enable colour display. I previously had it in "Auto Mode". The "VIdeo Mode" is the...

@Menhem Has this issue been resolved? I recently installed my C720 and the night vision is greyscale only. I also have installed the Tapo C325WB camera. With this camera the colour night vision is...