Row was not copied from the Treeview

Question

The row was not copied in Treeview, I made popup copy after I pressed in row and made copy and pasted in anywhere not pasted

The code

        popup = tk.Menu(tree_opportunity, tearoff=0)
        def row_copy():
            item = tree_opportunity.selection()[0]
            opportunity_frame.clipboard_clear()
            opportunity_frame.clipboard_append(tree_opportunity.item(item, 
            option='text'))
            
        popup.add_command(command=row_copy,label="Copy")
        def popup_menu(event):
            tree_opportunity.identify_row(event.y)
            popup.post(event.x_root, event.y_root)
        
        tree_opportunity.bind('<Button-3>', popup_menu)