I am not able to make my discord bot respond to events in the server

I just started learning how to build a discord bot from real python. I wrote my code as instructed. Here it is:

# bot.py
import os
import random

import discord

client = discord.Client(intents=discord.Intents.default())

@client.event
async def on_ready():
    print(f'{client.user.name} has connected to Discord!')

@client.event
async def on_member_join(member):
    await member.create_dm()
    await member.dm_channel.send(
        f'Hi {member.name}, welcome to my Discord server!'
    )

@client.event
async def on_message(message):
    if message.author == client.user:
        return

    brooklyn_99_quotes = [
        'I\'m the human form of the  emoji.',
        'Bingpot!',
        (
            'Cool. Cool cool cool cool cool cool cool, '
            'no doubt no doubt no doubt no doubt.'
        ),
    ]

    if message.content == '99!':
        response = random.choice(brooklyn_99_quotes)
        await message.channel.send(response)

client.run('don't u dare see my token')
#I am creating the file locally that's why I didn't use the .env file

I ran this code and this was the output:

(bot) D:\Programming\python\discord>python bot.py
[2022-09-17 14:34:29] [INFO    ] discord.client: logging in using static token
[2022-09-17 14:34:31] [INFO    ] discord.gateway: Shard ID None has connected to Gateway (Session ID: dfdc75d74ccf9705dc5e71a2fccdbc5e).
Pybot has connected to Discord!

But the main problem here is that whenever I use my secondary ACC. to join the server or send 99! to the server the bot never responds. Please help.