Bootstrap 5 - justifty-content-end is not working

I am trying to create a header using bootstrap 5. Within the header I have a navbar with links that I would like to float to the right. After looking on the bootstrap website I noticed that they added a justifty-content-end class to their menu list items. When I do this the items stay to the left. I have even tried adding float: right to the nav but this doesn't work either.

Here is my html

<nav class="navbar navbar-dark bg-dark">
  <!-- Navbar content -->
      <ul class="nav justify-content-end" id="myNavbar">
  <li class="nav-item">
    <a class="nav-link" href="#">Active</a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link</a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link</a>
  </li>
</ul>

My css

ul {
float: right !important:
}

Can someone please explain how to fix this?

Solution

Check this solution, I have tried in my machine, this code working properly.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" >
</head>
<body>

    <nav class="navbar navbar-dark bg-dark d-flex justify-content-end">
        <!-- Navbar content -->
            <ul class="nav" id="myNavbar">
        <li class="nav-item">
          <a class="nav-link" href="#">Active</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
      </ul>

      <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" ></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" ></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
    
</body>
</html>