MVC Core @User.Identity.Name in razor returns null

It runs just fine and returns the name on my local machine (windows authentication) by using @User.Identity.Name. However, if I move it from my local to dev server, it just returns the text without the name. Not sure why @User.Identity.Name doesn’t work when I push.

<div class="navbar-collapse">
   <p class="nav navbar-text navbar-right">    
      <script id="greetings">
         document.write('Hello, ');
      </script>
      @User.Identity.Name
  </p>
</div>

Answers:

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Method 1

It runs just fine and returns the name in my local (windows authentication) by using @User.Identity.Name. However, if I move it from my local to dev server, it just returns the text without the name.

As we discussed in comments, if Anonymous Authentication is enabled, which will cause this issue.

Besides, we can check if the user is authenticated first, then display the name of current non-anonymous user in view page instead of accessing User.Identity.Name directly.

<div class="navbar-collapse">
    <p class="nav navbar-text navbar-right">
        <script id="greetings">
            document.write('Hello, ');
        </script>
        
        @if (User.Identity.IsAuthenticated)
        {
            <span>@User.Identity.Name</span>
        }
        else
        {
            <span>Anonymous user</span>
        }

    </p>
</div>

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