Azure App Service returns 404 on POST request

Question

I have a WCF service that I have published to Azure via VS 2017. I can reach the service using the URL from a browser and it acts as expected. The service listens for outbound messages from Salesforce. If I send a message it returns with a 404 error. This same service works fine published to IIS on a server. Is there a setting in the App Service that will allow a POST to be processed?

Update: I think the issue is probably with the web.config Here is what I have:

  <system.serviceModel>
    <bindings />
    <client />
    <services>
      <service name="WorkflowNotificationServices.CaseNotificationService" behaviorConfiguration="debug">
        <endpoint binding="basicHttpBinding" contract="CaseNotificationService" />
      </service>
      <service name="WorkflowNotificationServices.CommentNotificationService" behaviorConfiguration="CommentNotificationServiceBehavior">
        <endpoint binding="basicHttpBinding" contract="CommentNotificationService" />
      </service>
      <service name="WorkflowNotificationServices.TaskNotificationService" behaviorConfiguration="TaskNotificationServiceBehavior">
        <endpoint binding="basicHttpBinding" contract="TaskNotificationService" />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="CaseNotificationServiceBehavior">
          <serviceMetadata httpGetEnabled="true" />
        </behavior>
        <behavior name="CommentNotificationServiceBehavior">
          <serviceMetadata httpGetEnabled="true" />
        </behavior>
        <behavior name="TaskNotificationServiceBehavior">
          <serviceMetadata httpGetEnabled="true" />
        </behavior>
        <behavior name="debug">
          <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior>
        <behavior name="">
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>

This works fine on a VM with IIS.