title: Custom emoji in discord.py (on_reaction_add) not working
body: <p>I'm sorry for my english, i'm french :P</p>
  <p>I'm doing a discord bot in python (i'm a beginner in python) and i'm doing it step by step. Right now, I want the bot react when user click on an emoji. I used 3 custom emojii, it's not working :(</p>
  <p>For the test, i tried with a :slight_smile: and it works perfectly. I don't know if i'm doing it wrong, or if i can't do that with  custom emojii...</p>
  <p>Can you help me finding what's going wrong on my code? :)</p>
  <pre><code>    @bot.command(name=&quot;mm&quot;,help=&quot;permet de créer une invit mm+ avec !mm clé niveau heure. Exemple: !mm Boralus +14 21h00&quot;)
  async def mm(ctx, arg, arg2, arg3):
      embed = discord.Embed(title=&quot;Inscription pour {} en {} vers {}&quot; .format(arg, arg2, arg3), description=&quot;Composition du groupe&quot;) #,color=Hex code
      embed.add_field(name=&quot;Tank&quot;, value=&quot;&lt;:tank:761252435720667157&gt;tank\n&quot;, inline = False)
      embed.add_field(name=&quot;Heal&quot;, value=&quot;&lt;:heal:761252937548169246&gt;heal\n&quot;, inline = False)
      embed.add_field(name=&quot;Dps1&quot;, value=&quot;&lt;:dps:761252937066217512&gt;dps1\n&quot;, inline = False)
      embed.add_field(name=&quot;Dps2&quot;, value=&quot;&lt;:dps:761252937066217512&gt;dps2\n&quot;, inline = False)
      embed.add_field(name=&quot;Dps3&quot;, value=&quot;&lt;:dps:761252937066217512&gt;dps3\n&quot;, inline = False)
  # On ajoute les emojis
      sent = await ctx.send(embed=embed)
      emojis=['&lt;:tank:761252435720667157&gt;', '&lt;:heal:761252937548169246&gt;', '&lt;:dps:761252937066217512&gt;', '' ]
      for emoji in emojis:
          await sent.add_reaction(emoji)
  # On réagit aux emoji
  @bot.event
  async def on_reaction_add(reaction, user):
      message = reaction.message
      emoji = reaction.emoji
      tank = &quot;&lt;:tank:761252435720667157&gt;&quot;
      heal = &quot;&lt;:heal:761252937548169246&gt;&quot;
      dps = &quot;&lt;:dps:761252937066217512&gt;&quot;
      test = &quot;&quot;
      if user.bot:
          return
  
      if emoji == tank:
          print (&quot;testtank&quot;)
      elif emoji == heal:
          print (&quot;testheal&quot;)
      elif emoji == dps:
          print (&quot;testdps&quot;)
      elif emoji == test:
          print (&quot;smiley&quot;)
      else:
          return
  </code></pre>