@bot.command()
async def start(ctx):
member_in_game = []
mess = await ctx.send('Чтобы присоединиться к игре у нажмите на реакцию')
await mess.add_reaction('✅')
mess = await ctx.channel.fetch_message(mess.id)
if yes_react := discord.utils.get(mess.reactions, emoji=ctx.guild.get_emoji(954803563668832377)):
async for members in yes_react.users:
print(members)
member_in_game.append(members)