[Answered ]-Can't close Django message alerts

use data-bs-dismiss="alert" instead of data-dismiss="alert"

you can try this

{% for message in messages %}
    <div class="alert alert-{{ message.tags }} alert-dismissible fade show" role="alert">
        {{ message }}
        <button type="button" class="close" data-dismiss="alert" aria-label="Close">
            <span aria-hidden="true">&times;</span>
        </button>
    </div>
{% endfor %}