Bootstrap form-flooting with input-groups

HTML

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css">
<div class="input-group mb-3">
    <span class="input-group-text" id="basic-addon-1">@</span>
   <span class="form-floating">
        <input type="text" class="form-control" id="username" aria-describedby="basic-addon-1" ... />
        <label for="username">Email Address</label>
   </span>
</div>