Calling Function That Acts On Matrix Range Within Another Function

I have a function

VB:
Function f1(Matrix As Range)
'Does something and returns f1 = a double
End Function

And a second function which defines and constructs a matrix of doubles to use as an argument in f1 to return a double:

VB:
Function f2(dD As Double)
Dim MatrixRed() As Double
Redim MatrixRed(1 To dD, 1 To 10)
For i = 1 To dD
For j = 1 To 10
MatrixRed(i, j) = i * j
Next
Next
f2 = f1(MatrixRed)
End Function

I get an output error (#VALUE). I think it has something to do with MatrixRed not being a range anymore?