Excel-outlook VBA 2013 not working on 2016 Outlook version - vba

Question

I'm having problems with a macro. It used to work on the 2013 version of outlook and excel but for some reason the CC function has stopped working and I keep getting errors.
With the 2013 version I used the following code to define the CC and BCC:
Set sh = Sheets ("Sheet1")
.to = cell.Value
.CC = sh.Cells(cell.Row, 1).Range("C1:C1")
.BCC = sh.Cells(cell.Row, 1).Range("D1:D1")
This however doesn't work in the 2016 version of my excel and outlook. Every single row in excel need to have its own To , CC and BCC selected from a row in Excel. For some reason it keeps saying CC is not a valid method. object_Mailitem failed.
Editing the variables behind the .cc and .bcc to "mail#x.com" is working without getting the error. So I assume there is something wrong with the line after the .cc, i've tried multiple solutions which ended up in either the same error or an other error telling me it doesn't recognize the .Send command.
EDIT: added the full code of the macro
Sub Send files()
Dim OutApp As Object
Dim OutMail As Object
Dim sh As Worksheet
Dim cell As Range
Dim FileCell As Range
Dim rng As Range
Dim ccontvangen As Range
With Application
.EnableEvents = False
.ScreenUpdating = False
End With
Set sh = Sheets("Sheet1")
Set OutApp = CreateObject("Outlook.Application")
For Each cell In sh.Columns("B").Cells.SpecialCells(xlCellTypeConstants)
Set rng = sh.Cells(cell.Row, 1).Range("E1:Z1")
If cell.Value Like "?*#?*.?*" And _
Application.WorksheetFunction.CountA(rng) > 0 Then
Set OutMail = OutApp.CreateItem(0)
With OutMail
.to = cell.Value
.cc = "x"
.Subject = "Subject"
.Attachments.Add "G:\signature.png", olByValue, 0
.Body = " "
For Each FileCell In rng.SpecialCells(xlCellTypeConstants)
If Trim(FileCell) <> "" Then
If Dir(FileCell.Value) <> "" Then
.Attachments.Add FileCell.Value
End If
End If
Next FileCell
.Send
End With
Set OutMail = Nothing
End If
Next cell
Set OutApp = Nothing
With Application
.EnableEvents = True
.ScreenUpdating = True
End With
End Sub

Answer 1

I had encountered a similar issue where the Subject Line, To, and Cc were not being listed completely.
I figured out the problem by adding a & ";" to the end of each field.