I can't add reactions to a message in discord.py

Title. Here is my current code:

@client.event
async def on_message(message):
    emoji = client.get_emoji(765173945056886814)
    if message.author.id == 236199051505303552:
        await message.add_reaction(emoji)

And the error i am getting is

line 1082, in _emoji_reaction
    raise InvalidArgument('emoji argument must be str, Emoji, or Reaction not {.__class__.__name__}.'.format(emoji))
discord.errors.InvalidArgument: emoji argument must be str, Emoji, or Reaction not NoneType.
We have logged in as Zinthium#3381
The program 'python.exe' has exited with code -1 (0xffffffff).

get the emoji code yourself on discord. by typing \emoji. \is basically the escape character in discord. emoji codes look like these <:klol:716218157060325387>

@client.event
async def on_message(message):
    if message.author.id == 236199051505303552:
        await message.add_reaction("emoji code")

Your code should actually work. I think the bot doesn't have access to that emoji. Maybe it is not in the server. So it returns None