matplotlib and tkinter window : change the icone in all windows

I am looking for replacing the default icone from the matplotlib and tkinter window by using a specific image I load (.gif image). It works on the main window (the plt.show() matplotlib window), but when I open a tkinter window by clicking on the button placed on the matplotlib window, I can't change the tkinter icone, I got the error "_tkinter.TclError: can't use "pyimage19" as iconphoto: not a photo image". However, when I don't replace the matplotlib icone, the icone of the tkinter window changes (by the way I can't replace the icone of the 2 windows at the same time, here is the problem).

import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt
import tkinter as tk
from PIL import Image,ImageTk

def ouvrir_fenetre(event):
    global fenetre

    try:fenetre.destroy()
    except:pass

    fenetre = tk.Tk()
    fenetre.title("Fenêtre Tkinter")

##    fenetre.tk.call("wm","iconphoto",fenetre._w,tk.PhotoImage(file="accueil.gif"))
    image_tkinter = Image.open('accueil.gif')
    photo_tkinter = ImageTk.PhotoImage(image_tkinter) # Error: "_tkinter.TclError: can't use "pyimage19" as iconphoto: not a photo image"
    fenetre.iconphoto(False, photo_tkinter)

    fenetre.mainloop()

fig, ax = plt.subplots()

manager = plt.get_current_fig_manager()
window = manager.window
image_matplotlib = Image.open('accueil.gif')
photo_matplotlib = ImageTk.PhotoImage(image_matplotlib)
window.iconphoto(False, photo_matplotlib)

button = plt.axes([0.9, 0, 0.1, 0.05])
btn = plt.Button(button, 'Tkinter')
btn.on_clicked(ouvrir_fenetre)

plt.show()

I tried to load 2 different images, I got the same error. I tried too to use this command "fenetre.tk.call("wm","iconphoto",fenetre._w,tk.PhotoImage(file="accueil.gif"))", but I got the same error.

Thank you for the help