I tried that actually but it still doesn't let you color each point with the RGB value combination for each point. All you can do is assigning a different symbol for each combination loaded from the available color palettes. Of course I could edit each symbol for all the combination, but that would take lots of time. I was wondering if you could assign the RGB values automatically. It's easy to do in raster but not for point files it seems.
In the layer properties, you can st the symbology to be "unique values, many fields." Each combination of the fields you choose (up to 3) can be assigned a different symbol.
I too, am having this issue. I have seen numerous posts/threads with this issue but I have never seen a solution. I'm assuming there Is a way to automate this is Python, but unfortunately I have little experience programming.