Can't do it with a formula. So try some code.
Press Alt + F11 > insert new module > paste in the below > close VB editor > Press Alt + F8 > Select InsertRow.
Note: Assumes data In col A. Change the A reference to your column ref
Sub InsertRow()
Dim LastRow As Long, i As Long
LastRow = Cells(Rows.Count, "A").End(xlUp).Row
Application.ScreenUpdating = False
For i = LastRow To 2 Step -1
If Cells(i, "A").Value <> Cells(i - 1, "A").Value Then
Rows(i).Insert Shift:=xlDown
End If
Next i
Application.ScreenUpdating = True
End Sub
VBA Noob
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