[Python] InlineKeyboardButton with callback_data doesn't work

InlineKeyboardButton with callback_data doesn't work. When I click on it, nothing happens.

Here is how I create the button:

from django.apps import apps
from asgiref.sync import sync_to_async
from telegram import Update, InlineKeyboardMarkup, InlineKeyboardButton, WebAppInfo
from telegram.ext import CommandHandler, ApplicationBuilder, MessageHandler, filters, CallbackQueryHandler

async def start(self, update: Update, context):
keyboard = InlineKeyboardMarkup([
[InlineKeyboardButton("Already registred", callback_data="already_registered")],
[InlineKeyboardButton("Register", web_app=WebAppInfo(url=WEB_APP_URL))]
])

await update.message.reply_text(
"Welcome",
reply_markup=keyboard
)
return


This is the callback query handler:

async def button(self, update: Update, context):
query = update.callback_query
if not query:
return

await query.answer()

if query.data == "already_registered":
await context.bot.send_message(
chat_id=update.message.chat_id,
text='Good'
)
return


and this is how I run:

def run(self):
TOKEN = apps.get_model('app.Config').objects.get_mailing_tg_bot_token()
app = ApplicationBuilder().token(TOKEN).build()
app.add_handler(CommandHandler('start', self.start))
app.add_handler(CallbackQueryHandler(self.button))

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