Trying To Insert Nested Concatenate Function In VBA

I am trying to concatenate the text of a few cells in a specific worksheet. I'm not wanting to use the STRING & STRING type code because I already had a Concatenate formula nested with an index formula and needed to have this formula copied to a certain RANGE, Where the RANGE was specified by a Variable. T

he Code below does what I need if the CONCATENATE/INDEX formula is in the cell that im copying already. (BELOW) The Formula in the cell, for example, on row 19 of worksheet "COMMISSION", that needs to be copied and incremented down the VARIABLE RANGE is

=CONCATENATE(INDEX(OUTPUTS!J:J,(ROW(OUTPUTS!J2)-1)*2+1)," ",INDEX(OUTPUTS!K:K,(ROW(OUTPUTS!K2)-1)*2+1)).

VB:
Dim iInput_Rows As Integer
iInput_Rows = Worksheets("Workspace").Range("D3").Value
Dim iOutput_Rows As Integer
iOutput_Rows = Worksheets("Workspace").Range("D1").Value
Dim iAnalog_Rows As Integer

[Code] ....

My problem is when I use the following code to insert that concatenate/index formula, through vba, then I get errors because it evidently doesnt like the " " for the space i needed between texts. (The Formula is concatenating text in those cells but every other Row) Can I do this in VBA?

VB:
Worksheets("COMMISSION").Range("B19 + iOutputs_Rows").Formula = "=CONCATENATE(INDEX(OUTPUTS!J:J,(ROW(OUTPUTS!J2)-1)*2+1)," ",INDEX(OUTPUTS!K:K,(ROW(OUTPUTS!K2)-1)*2+1))"