Не работает система регистрации в django

forms.py:

class UserRegistrationForm(UserCreationForm):
    first_name = forms.CharField(widget=forms.TextInput(attrs={
        'class' : 'form-control py-4', 'placeholder' : 'Введите имя',
    }))
    last_name = forms.CharField(widget=forms.TextInput(attrs={
        'class' : 'form-control py-4', 'placeholder' : 'Введите фамилию'
    }))
    username = forms.CharField(widget=forms.TextInput(attrs={
        'class' : 'form-control py-4', 'placeholder' : 'Введите имя пользователя'
    }))
    email = forms.EmailField(widget=forms.EmailInput(attrs={
        'class' : 'form-control py-4', 'placeholder' : 'Введите адрес эл. почты'
    }))
    password1 = forms.CharField(widget=forms.PasswordInput(attrs={
        'class' : 'form-control py-4', 'placeholder' : 'Введите пароль'
    }))
    password2 = forms.CharField(widget=forms.PasswordInput(attrs={
        'class' : 'form-control py-4', 'placeholder' : 'Подтвердите пароль'
    }))
    
    class Meta:
        model = User
        fields = ('first_name', 'last_name', 'username', 'email', 'password1', 'password2')

views.py:

def registration(request):
    if request.method == 'POST':
        form = UserRegistrationForm(data=request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('index'))
    else:
        form = UserRegistrationForm()
            
    context = {'form' : form}
    return render(request, 'users/registration.html', context)

HTML:

<form action="{% url 'users:registration' %}" method="post">
                            {% csrf_token %}
                            <div class="form-row">
                                <div class="col-md-6">
                                    <div class="form-group">
                                        <label class="small mb-1" for="{{ form.first_name.id_for_label }}">Имя</label>
                                        {{ form.first_name }}
                                    </div>
                                </div>
                                <div class="col-md-6">
                                    <div class="form-group">
                                        <label class="small mb-1" for="{{ form.last_name.id_for_label }}">Фамилия</label>
                                        {{ form.last_name }}
                                    </div>
                                </div>
                            </div>
                            <div class="form-row">
                                <div class="col-md-6">
                                    <label class="small mb-1" for="{{ form.username.id_for_label }}">Имя пользователя</label>
                                    {{ form.username }}
                                </div>
                                <div class="col-md-6">
                                    <label class="small mb-1" for="{{ form.email.id_for_label }}">Адрес электронной
                                        почты</label>
                                    {{ form.email }}
                                </div>
                            </div>
                            <div class="form-row">
                                <div class="col-md-6">
                                    <div class="form-group">
                                        <label class="small mb-1" for="{{ form.password1.id_for_label }}">Пароль</label>
                                        {{ form.password1 }}
                                    </div>
                                </div>
                                <div class="col-md-6">
                                    <div class="form-group">
                                        <label class="small mb-1" for="{{ form.password2.id_for_label }}">Подтверждение
                                            пароля</label>
                                        {{ form.password2 }}
                                    </div>
                                </div>
                            </div>
                            <div class="form-group mt-4 mb-0">
                                <input class="btn btn-primary btn-block" type="submit" value="Создать аккаунт">
                            </div>
                        </form>