Requesting help to get through this Trailhead module. There are several postings, but I have yet to find definative answer to help me get past 
where I am stuck. 

I have completed all steps of the Module, and am now at Testing Your Chat. 

When I execute the VF page, I do get the buttons as desired (depending on if an agent is logged into Chat), but when I click to test
chat, I receive a Authorization Required error message . 

Here is my VF Code.   I have gone back over the instructions and have been racking my brain for a couple hours trying different things and 
am still stuck.   Any help is greatly appreciated.  

<apex:page >
  <h1>Let’s start chatting...</h1>
  <br />
  Click the big button to start a chat.
  <br />
  <!--Button Code-->
<img id="liveagent_button_online_573o0000000TV8K" style="display: none; border: 0px none; cursor: pointer" onclick="liveagent.startChat('573o0000000TV8K')" src="https://leopoldml-developer-edition.na17.force.com/LEO/resource/1483146815000/ChatWindow" /><img id="liveagent_button_offline_573o0000000TV8K" style="display: none; border: 0px none; " src="https://leopoldml-developer-edition.na17.force.com/LEO/resource/1483146782000/OfflineButton" />
<script type="text/javascript">
if (!window._laq) { window._laq = []; }
window._laq.push(function(){liveagent.showWhenOnline('573o0000000TV8K', document.getElementById('liveagent_button_online_573o0000000TV8K'));
liveagent.showWhenOffline('573o0000000TV8K', document.getElementById('liveagent_button_offline_573o0000000TV8K'));
});</script>

  <!--Deployment Code-->
<script type='text/javascript' src='https://c.la3-c1-was.salesforceliveagent.com/content/g/js/38.0/deployment.js'></script>
<script type='text/javascript'>
liveagent.init('https://d.la3-c1-was.salesforceliveagent.com/chat', '572o0000000TTsm', '00Do0000000ZcLj');
</script>
</apex:page>

 

Requesting help to get through this Trailhead module. There are several postings, but I have yet to find definative answer to help me get past 
where I am stuck. 

I have completed all steps of the Module, and am now at Testing Your Chat. 

When I execute the VF page, I do get the buttons as desired (depending on if an agent is logged into Chat), but when I click to test
chat, I receive a Authorization Required error message . 

Here is my VF Code.   I have gone back over the instructions and have been racking my brain for a couple hours trying different things and 
am still stuck.   Any help is greatly appreciated.  

<apex:page >
  <h1>Let’s start chatting...</h1>
  <br />
  Click the big button to start a chat.
  <br />
  <!--Button Code-->
<img id="liveagent_button_online_573o0000000TV8K" style="display: none; border: 0px none; cursor: pointer" onclick="liveagent.startChat('573o0000000TV8K')" src="https://leopoldml-developer-edition.na17.force.com/LEO/resource/1483146815000/ChatWindow" /><img id="liveagent_button_offline_573o0000000TV8K" style="display: none; border: 0px none; " src="https://leopoldml-developer-edition.na17.force.com/LEO/resource/1483146782000/OfflineButton" />
<script type="text/javascript">
if (!window._laq) { window._laq = []; }
window._laq.push(function(){liveagent.showWhenOnline('573o0000000TV8K', document.getElementById('liveagent_button_online_573o0000000TV8K'));
liveagent.showWhenOffline('573o0000000TV8K', document.getElementById('liveagent_button_offline_573o0000000TV8K'));
});</script>

  <!--Deployment Code-->
<script type='text/javascript' src='https://c.la3-c1-was.salesforceliveagent.com/content/g/js/38.0/deployment.js'></script>
<script type='text/javascript'>
liveagent.init('https://d.la3-c1-was.salesforceliveagent.com/chat', '572o0000000TTsm', '00Do0000000ZcLj');
</script>
</apex:page>

 

I'm going through the trailhead Identity for Customers.  In the second unit, Prepare Your Org for External Identity, the instructions to create a profile is to clone the standard profile External Identity User.  I'm in my dev org and I do not see that profile.  What would I need to do to get that profile to be visible?