I can't get Dynamic Material Color changes to work...

Ok. Ive tried to simplify it so that it goes straight to a Create Dynamic Mat Inst Node then straight to a Vector Para Value Node and manualy set the color via Make Linear Color.

It did not work and I after a debug break, noticed the Return Value of the Create Dynamic Mat Inst Node is now ‘None’.

If anyone has any ideas, or would like more information about how I have set up the mats and values please let me know.
Thanks.