Прямая форма modelform не проходит валидацию при отправке формы

У меня есть довольно простая ModelForm, которая не проходит валидацию при отправке. Не знаю, как это отладить. Я пробовал различные операторы печати в моем представлении, и все вроде бы правильно.

Вот что у меня есть:

# views.py

def render_entities(request):
    """View to render the entities overview page"""

    # Get the logged in user instance
    user = User.objects.get(username=request.user.username)
    user_cashpool = Cashpool.objects.get(company__user=user)

    # Get the info for the site visited
    dashboard_site = 'entities'

    if request.method == 'GET':

        # Return the form and populate with user's company
        company = user.company

        # Query all entities associated to the cashpool
        companies = Company.objects.filter(cashpool=user_cashpool).order_by('name')

        # Pass the queryset to the Select Form
        CompanyForm.base_fields['company'] = forms.ModelChoiceField(
            queryset=companies)

        # Return the form
        form = CompanyForm()

        context = {
            'company': company,
            'companies': companies,
            'dashboard_site': dashboard_site,
            'form': form
        }

        return render(request, 'dashboard/dashboard_entities.html', context)

    else:
        form = CompanyForm(request.POST)
        if form.is_valid():    # fails

            # Get the cleaned inputs
            company = form.cleaned_data['company']
    ...

# forms.py

class CompanyForm(forms.ModelForm):
    """
    A form to render a select widget with companies associated to a user
    """
    company = forms.ModelChoiceField(queryset=Company.objects.exclude(name='exclude-all'), required=True)

    class Meta:
        model = Company
        fields = ['name']

# template

    <!-- Select Company -->
    <form action="entities" method="post">
        {% csrf_token %}

        <label for="company">Select a Company</label>
        {{ form.company }}
        <button type="submit" value="Load Company" class="submit-button">Load Company</button>
    </form>

Ошибка

<ul class="errorlist"><li>name<ul class="errorlist"><li>This field is required.</li></ul></li></ul>

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