'Bootstrap 5.1 dropdown menu align right not working

I want to align my dropdown menu (responsively) on the right side of the page while keeping the "Create Event" button on the left. The docs call for adding .dropdown-menu-end to the ul class--which didn't work--so I've added it to every class for my dropdown and still no luck.

What's going on with my code?

<head>
  <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/font/bootstrap-icons.css">
</head>

<body>
  <div>
    <a class="btn btn-primary mb-2" href="/events/new">Create event</a>

    <span class="dropdown dropdown-menu-end">
            <a class="btn btn-outline-primary dropdown-toggle bi bi-filter mb-2 dropdown-menu-end" href="#" role="button" id="dropdownMenuLink" data-bs-toggle="dropdown" aria-expanded="false">
                Events
            </a>
          
            <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="dropdownMenuLink">
              <li><a class="dropdown-item" href="/events">All Events</a></li>
              <li><a class="dropdown-item" href="/events/?future=true">Upcoming Events</a></li>
              <li><a class="dropdown-item" href="/events/?past=true">Past Events</a></li>
            </ul>
        </span>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
</body>


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Source: Stack Overflow

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