Object Required error, on FoundCell = RangeToSearch.find(string)

Having an odd issue, probably something very simple I'm overlooking. I've used the code below on dozens of other macros without issue, but for some reason this time I'm getting a 1004 error, Object Required on the line

Set FoundCell = RangeToSearch.Find(What:=sWhat, LookIn:=xlValues, LookAt:=xlPart).Activate

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in the below code, any suggestions on what could be causing this would be greatly appreciated.

Dim wb As Workbook 
Dim sDir As String, sProj As String, sColBillable As String, sColProj As String, sColWBS As String
Dim ArrBillable() As String, sWhat As String
Dim i As Integer, iRow As Integer
Dim RangeToSearch As Range
Dim FoundCell As Range
Dim lCol As Long

sWhat = "Billing"

Set wb = Workbooks.Open("\\xxxxx\xxxxx\_xxxxx\file.xlsm", False, True)

With wb
    Set RangeToSearch = Selection
    Set FoundCell = RangeToSearch.Find(What:=sWhat, LookIn:=xlValues, LookAt:=xlPart).Activate
        If Not FoundCell Is Nothing Then
            lCol = RangeToSearch.Find("Billing").Column
            sColBillable = ColumnName(lCol)
        End if

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Martin LissOlder than dirtCommented:
Remove the .Activate

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Conor_NewmanAuthor Commented:
Thank you.
Martin LissOlder than dirtCommented:
You're welcome and I'm glad I was able to help.

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