Not working with flask 3.1.0

[learncodingforweb]

from flask import Flask
from flask_debugtoolbar import DebugToolbarExtension


app=Flask(__name__)
app.debug=True

app.config['SECRET_KEY']="sjsdghesrhgnesrkgnesr"
# app.config["DEBUG_TB_INTERCEPT_REDIRECTS"] = True
# app.config["DEBUG_TB_ENABLED"] = True


toolbar = DebugToolbarExtension(app)
# toolbar.init_app(app)

@app.route('/')
def index():
    return "home page"

if __name__=='__main__':
    app.run(host='0.0.0.0', port=9000)

Environment:
using uv for dependecy management

[project]
name = "flask-debugger-tutorial"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.13"
dependencies = [
    "flask>=3.1.0",
    "flask-debugtoolbar>=0.16.0",
]

Not able to see any toolbar in browser, i tried on chrome and firebox browser