How can I count the colour of cells with conditional formatting

Someone gave me a great routine to count the colour of cells in a range.

Code:

Function CountCcolor(range_data As Range, criteria As Range) As Long
Dim datax As Range
Dim xcolor As Long
xcolor = criteria.Interior.ColorIndex
For Each datax In range_data
If datax.Interior.ColorIndex = xcolor Then
CountCcolor = CountCcolor + 1
End If
Next datax
End Function

But - that doesn't work if the colour is applied with conditional formatting. And I can't find a routine which does work for that. I thought it would be "DisplayFormat.Interior" but that doesn't work (for me).
Does anyone have any idea how I can get the colour count if the colour is applied with conditional formatting?
Thanks for any advice
This is for the latest Excel from Office 365. Running on WIndows 10 - latest updates.
Alan

Yes, but that doesn't work when the cells are coloured by a conditional format statement.

thanks

Alan