title: Salesforce - Aura Component publish using message service issue
body: <p>I am trying to publish data from Aura to LWC. I am getting error to rectify what I am missing.
  I checked multiple examples as syntax wise, still didn't work. Hence posting to see if anyone can help out.</p>
  <p>Aura Component html:</p>
  <pre><code>&lt;aura:component implements=&quot;flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId&quot; access=&quot;global&quot; &gt;
     &lt;a href=&quot;javascript:void(0);&quot; onclick=&quot;{!c.publishMC}&quot;&gt;More Information&lt;/a&gt;
     &lt;lightning:messageChannel type=&quot;AlertMessageChannel__c&quot; aura:id=&quot;AlertMessageChannel&quot;&gt;&lt;/lightning:messageChannel&gt;
  &lt;/aura:component&gt;
  </code></pre>
  <p>Aura Controller JS:</p>
  <pre><code>({
  publishMC : function(component, event, helper) {
      var messageInfo = [
          { normalTxt: '', boldTxt: '', boldLeftTxt: 'This opportunity is Stale', 
          normalRightTxt: 'the stale reason code is EOD PAST DUE.'},
          { normalTxt: '', boldTxt: '', boldLeftTxt: 'This account has 1 or more Frame 
           Agreements', normalRightTxt: 'There is a Frame Agreement associated to the account, 
           if applicable, please link to this opportunity using the Contract ID field.'},
      ];
      component.find(&quot;AlertMessageChannel&quot;).publish(messageInfo);
      }
  })
  </code></pre>
  <p>I have also added Message Service xml file too</p>
  <pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
  &lt;LightningMessageChannel xmlns=&quot;http://soap.sforce.com/2006/04/metadata&quot;&gt;
  &lt;description&gt;This is a alert message channel communicator&lt;/description&gt;
  &lt;isExposed&gt;true&lt;/isExposed&gt;
  &lt;lightningMessageFields&gt;
      &lt;description&gt;Header information passed into alert modal window&lt;/description&gt;
      &lt;fieldName&gt;alertHeaderInfo&lt;/fieldName&gt;
  &lt;/lightningMessageFields&gt;
  &lt;lightningMessageFields&gt;
      &lt;description&gt;Body information passed into alert modal window&lt;/description&gt;
      &lt;fieldName&gt;alertBodyInfo&lt;/fieldName&gt;
  &lt;/lightningMessageFields&gt;
  &lt;lightningMessageFields&gt;
      &lt;description&gt;Show/Hide information passed into alert modal window&lt;/description&gt;
      &lt;fieldName&gt;alertVisibleInfo&lt;/fieldName&gt;
  &lt;/lightningMessageFields&gt;
  &lt;masterLabel&gt;AlertMessageChannel&lt;/masterLabel&gt;
  </code></pre>
  
  <p>But when try to load, getting error as :</p>
  <p>Action failed: lightning:messageChannel$controller$init [Lightning Message Service - unrecognized MessageChannel reference: AlertMessageChannel__c]</p>
  <p>Can any one help me, what I am missing?</p>