[Python] Can't figure out customtkinter favicon

This is a simple application I'm making that organizes folder, but that part works fine. I'm make a GUi for it using custom tkinter and cant figure out how to set the favicon, whatever I do just does not work. Right now, if I run the application the Icon does not change the favicon, but if I hit the button and press do the function, then the favicon appears in the main window, but not the popup? Very confusing.

import customtkinter as ctk
from PIL import Image, ImageTk
import os

def create_app():
global tk_icon

# Set appearance and theme
ctk.set_appearance_mode("System") # Modes: "System" (default), "Dark", "Light"
ctk.set_default_color_theme("blue") # Themes: "blue" (default), "green", "dark-blue"

def center_window(window, width, height):
screen_width = window.winfo_screenwidth()
screen_height = window.winfo_screenheight()
x = (screen_width // 2) - (width // 2)
y = (screen_height // 2) - (height // 2)
window.geometry(f"{width}x{height}+{x}+{y}")

# Initialize main window
root = ctk.CTk()
center_window(root, 400, 300)
icon_path = os.path.abspath("favicon.png")
img = Image.open(icon_path)
tk_icon = ImageTk.PhotoImage(img)

root.iconphoto(True, tk_icon)
root.title("FileOrganizer")
root.resizable(width=False, height=False)



# Configure grid to center widgets
root.grid_columnconfigure(0, weight=1)
root.grid_rowconfigure(0, weight=1)
root.grid_rowconfigure(1, weight=1)

def show_popup():
popup = ctk.CTkToplevel(root)
center_window(popup, 300, 150)
popup.title("Success")
popup.attributes('-topmost', True)
popup.resizable(width=False, height=False)
root.iconphoto(False, tk_icon)

popup_label = ctk.CTkLabel(popup, text="ⓘ Folder organized succesfully", font=("Arial", 14))
popup_label.pack(pady=20)

close_button = ctk.CTkButton(popup, text="Close", command=popup.destroy)
close_button.pack(pady=10)

# Load and display logo (place 'logo.png' in the same directory)
try:
img = Image.open("logo.png")
logo_image = ctk.CTkImage(light_image=img, dark_image=img, size=(150, 150))
logo_label = ctk.CTkLabel(master=root, image=logo_image, text="")
logo_label.grid(row=0, column=0, pady=(20, 10))
except Exception as e:
print(f"Error loading logo: {e}")

# Create a larger centered button
def on_button_click():
ogDir = os.getcwd()
os.chdir(ctk.filedialog.askdirectory())
for item in os.listdir():
filename, extension = os.path.splitext(item)
proposedDir = os.path.join(os.getcwd(), extension.replace(".", "").upper())

if not os.path.isdir(item):

if not os.path.exists(proposedDir):
os.makedirs(os.path.join(os.getcwd(), extension.replace(".", "").upper()))

os.rename(os.path.abspath(item), os.path.join(proposedDir, item))
os.chdir(ogDir)
show_popup()

button = ctk.CTkButton(
master=root,
text="Organize Folder",
command=on_button_click,
font=("Product Sans", 14)
)
button.grid(row=1, column=0)

# Start the GUI event loop
root.mainloop()



if __name__ == "__main__":
create_app()


I tried using bitmap, but wanted it to be cross platform, I'm new to customtkinter

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