Why is celery background task not working?

Question

Redis

Hello. The celery background task is not working (my print is missing). What could be the problem? radish server started

from flask import Flask
from flask_socketio import SocketIO
from celery import Celery



app = Flask(__name__, static_url_path="", static_folder='/')
app.config['SECRET_KEY'] = 'gjr39dkjn344_!67#'
app.config['CELERY_BROKER_URL'] = 'redis://127.0.0.1:6379/'
app.config['CELERY_RESULT_BACKEND'] = 'redis://127.0.0.1:6379/'


celery = Celery(app.name, broker=app.config['CELERY_BROKER_URL'])
celery.conf.update(app.config)

@celery.task()
async def my_background_task():
    print("work")
    return "sss"

@app.route("/")
async def main():
    task = my_background_task.delay()
    print(task)
    return "sss"

app.run()