'variable is empty even after using global to make it global scoped

I want my program to welcome someone as soon as they join a discord server (discord.py), and that part works fine. However, to get the guild name, my program sends a message in a channel, and then it checks if it sent the message in the required channel and gets the guild name from there using message.guild.name. now for this to work, it needs to be global scoped because i have two functions in my code, one being on_message and the other being on_member_join. Somehow, it works without an error but when it's sending the welcome message, it just registers the guild name as an empty string. Why?

Here's my code for more clarity:

client = discord.Client()
serverName = ""

@client.event
async def on_message(message):
    if message.content.lower() == "a new member has arrived" and message.author == client.user:
        global serverName
        serverName = message.guild.name

@client.event
async def on_member_join(member):
    embed = discord.Embed(title="Welcome to " + serverName) #here it shows the initially declared empty string.
    await member.send(embed=embed)
    await client.get_channel(channelId).send("A new member has arrived")

Solution 1:^[1]

You don't need to send a message to get the guild name. On member join there is a discord.Member parameter which is a member of the guild. there u can get the guild name by member.guild.name

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Solution 1	Yash Verma

'variable is empty even after using global to make it global scoped

Solution 1:[1]

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Solution 1:^[1]