[Python] Python Tkinter how to change the text within a frame within a sub window

Hello I want some help figuring out how to change the text of a tk.label that is in a subframe

here is the code.

from time import sleep # Imported the sleep funtion from time for delays
from tkinter import * # Imported all of the tkinter functions associated with creating the GUI
from tkinter.ttk import Progressbar
from threading import Thread
import tkinter as tk
#import pyvisa
from serial import*
from tkinter import ttk
from PIL import ImageTk, Image
import threading


#####################################################################################
########################## Quick adjustments ########################################

MainTitleTextSize = 24
GeneralTitleTextSize = 20
GeneralTextSize = 18
LabelTextFont = "Georgia"
ButtonTextFont = "Georgia Bold"
Backgroundcolor = "Black"
Bordercolor = "cyan"
BorderThickness = 4
ProgramSelectedTextcolor = "green"
ForgroundFramecolor = "#8ad9ff"
ForgroundLabelcolor = "#8ad9ff"
ForgroundButtoncolor = "#8ad9ff"
Labelcolor1 = "green2"
Labelcolor2 = "#8ad9ff"
DrManhatanBlue = "#8ad9ff"

DarkMode = "#1e1e1e"
DrManhatanBlue = "#8ad9ff"
root=tk.Tk() # Instantiates a Tk object
root.title("Tester")
root.configure(bg=DarkMode)
root.geometry('1000x800')

OPCUA_Var = tk.StringVar()
#####################################################################################
########################## OPCUA Window Popup #######################################

# function to open a new window
# on a button click
def open_OPCUA_Window():

# Toplevel object which will
# be treated as a new window
OPCUAWindow = tk.Toplevel(root)
OPCUAWindow.title("OPCUA Configuration")
OPCUAWindow.configure(bg=DarkMode) # Changes the background to this color
OPCUAWindow.geometry("600x400")
# A Label widget to show in toplevel
OPCFrame = tk.LabelFrame(OPCUAWindow, text="", padx=5, pady=5, bg=DarkMode, fg=ForgroundFramecolor , font=(LabelTextFont, 18))
OPCLabel = tk.Label(OPCFrame, text=" OPCUA Settings " , padx=5, pady=5, bg=DarkMode, fg=ForgroundFramecolor , font=(LabelTextFont, 18))
OPCcommand_label = tk.Label(OPCFrame, text =" Manual Command :", bg=DarkMode, fg=ForgroundFramecolor , font=(LabelTextFont, 12))
OPCcommand_entry = tk.Entry(OPCFrame,textvariable = OPCUA_Var, font=('calibre',12,'normal'))
OPCsub_btn = tk.Button(OPCFrame,text = 'Submit',padx=5, pady=5, bg=DarkMode, fg=ForgroundFramecolor , font=(LabelTextFont, 12), command = OPCsubmit)
OPCReturn = tk.Label(OPCFrame, text =" return :", bg=DarkMode, fg=ForgroundFramecolor , font=(LabelTextFont, 12))

OPCFrame.grid( row=0, column=0, sticky="w")
OPCLabel.grid( row=0, column=0, sticky="w")
OPCcommand_label.grid( row=1, column=0, sticky="w")
OPCcommand_entry.grid( row=1, column=1, sticky="E")
OPCsub_btn.grid( row=1, column=2, sticky="w")
OPCReturn.grid( row=2, column=0, sticky="E")

#####################################################################################
########### Manual input functions for OPC Configuration Window ##################

def OPCUA_COMMAND(OPCcommand):

passthrough = OPCcommand


Datapopup.config(text = passthrough)
OPCReturn.config(text = passthrough)







def OPCsubmit():

opccommand=OPCUA_Var.get()


print("The command sent was:" + opccommand)

OPCUA_COMMAND(opccommand)

OPCUA_Var.set("")


##############################################################################
###########################Navigation frame###################################

NavigationFrame = tk.LabelFrame(root, text="", padx=5, pady=5, bg=DarkMode, fg=ForgroundFramecolor , font=(LabelTextFont, 18))
NavigationLabel = tk.Label(NavigationFrame, text=" Navigation " , bg=DarkMode, fg=DrManhatanBlue, font=("Georgia", 12))

NavigationButton3 = tk.Button(NavigationFrame, text=" OPCUA Configuration " , bg=DrManhatanBlue, fg="black", font=("Georgia", 12),command = open_OPCUA_Window)


NavigationFrame.grid( row=5,padx=10,pady=0, sticky="we", columnspan=10,rowspan=2)
NavigationLabel.grid( row=0, columnspan=6, sticky="w",rowspan=2)
NavigationButton3.grid( row=1, column = 2, sticky="w",rowspan=2)

##############################################################################
###########################Data frame#########################################

DataFrame = tk.LabelFrame(root, text="", padx=5, pady=5, bg=DarkMode, fg=ForgroundFramecolor , font=(LabelTextFont, 18))
DataLabel = tk.Label(DataFrame, text="Data : " , bg=DarkMode, fg=DrManhatanBlue, font=("Georgia", 12))
Datapopup = tk.Label(DataFrame, text=" " , bg=DarkMode, fg=DrManhatanBlue, font=("Georgia", 12))

DataFrame.grid( row=3,padx=10,pady=0, sticky="we", columnspan=6,rowspan=2)
DataLabel.grid( row=0, column = 1, sticky="w",rowspan=2)
Datapopup.grid( row=0, column = 2, sticky="w",rowspan=2, columnspan=5,)


root.mainloop()




You can see that I am cable to configure the text in the "data frame" window but when I try to change the text in the "opcua window pop up"
I get a NameError: name 'OPCReturn' is not defined when I try to run OPCReturn.config(text = passthrough)

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