Pycord mute command doesn't throw error but doesn't add role

Question

I am using pycord for this so I can use slash commands.

Here is my code:

import discord, os
from dotenv import load_dotenv
from discord.ext import commands

load_dotenv(f'{os.getcwd()}/token.env')

bot = commands.Bot()

token = str(os.getenv('TOKEN'))
@bot.slash_command(description = 'mutes member of choice')
@commands.has_permissions(administrator = True)
async def mute(ctx, member: discord.Member):
    guild = ctx.guild
    mutedRole = discord.utils.get(guild.roles, name="Muted")

    if not mutedRole:
        mutedRole = await guild.create_role(name="Muted")

        for channel in guild.channels:
            await channel.set_permissions(mutedRole, speak=False, send_messages=False, read_message_history=True, read_messages=False)

    await member.add_roles(mutedRole)
    await ctx.send(f"Muted {member.mention}")

@mute.error
async def permserror(ctx, error):
    if isinstance(error, commands.MissingPermissions):
        ctx.respond('Sorry! You dont have permission.')

@bot.event
async def on_ready():
    print(f'Client ready as {bot.user}')

bot.run(token)

This isn't my full code, but the other commands don't seem necessary for my problem.

Anyway, when I try to use this command, it doesn't throw an error in the console, but the application doesn't respond and it doesn't add the role.

I put a print statement between each line of code, and it seems to stop just before it adds the role.

How can I fix this?

Update: My previous code did not run so I have updated it.