Can't view your screenshot, so not sure how your formula is setup.
However, the ColorValue function expects one of a few inputs:
- CSS color name
- Hex 6 digit
- Hex 8 digit
Unfortunately, although there are enumerated colors in Power Apps, they won't resolve from a text input. Specifically, "White" as a text string is not the same as White (no quotes) in a formula bar. If your source has text color names, you can simply resolve the string/text using a lookup collection.
ClearCollect(colColorReferences,{tblColorString: "White", tblColorEnumerated: White})
Then you can try to find the color from your source.
ColorValue(LookUp(colColorReferences, ThisItem.Color = tblColorString, tblColorEnumerated))
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-colors