Error 403 (Csfr token not valid)

I have the following files:

#views.py
from django.views.generic.edit import FormView
from django.views.generic.base import TemplateView
from braces.views import AnonymousRequiredMixin, CsrfExemptMixin


#exempting from Csfr as the worst it can do is making lots of new users
class LogonView(CsrfExemptMixin, AnonymousRequiredMixin, FormView):
    "the page to create a new user"

    from .forms import LogonForm as form_class
    template_name = "registration/logon.html"
    from django.urls import reverse_lazy
    authenticated_redirect_url = reverse_lazy("success")
    success_url = authenticated_redirect_url

    def form_valid(self, form):
        u = form.save(commit=False)
        u.set_password(form.cleaned_data["password"])
        u.save()
        from django.contrib.auth import login
        login(self.request, u)
        return super().form_valid(form)


class SuccessView(TemplateView):
    template_name = "registration/success.html"




#forms.py
from django import forms as f


class LogonForm(f.ModelForm):
    "The form to create a new user"

    # repeat the password form
    password2 = f.CharField(
        label="Please repeat your password",
        widget=f.PasswordInput,
    )

    class Meta:
        from django.contrib.auth.models import User as model
        fields = ("username", "email", "first_name", "last_name",
"password")
        widgets = {"password": f.PasswordInput, }

    def clean(self):
        c = super().clean()
        pwd = c.get("password")
        if pwd and pwd == c.get("password2"):
            return c
        raise f.ValidationError(

            "You need to repeat the passwords identically")



#urls.py
from django.urls import path, include
from .views import *

urlpatterns = [
    path('', include('django.contrib.auth.urls')),
    path("logon/", LogonView.as_view(), name="logon"),
    path("success/",SuccessView.as_view(),name="success")
]




When I try to access /logon and fill the resulting form,it gives me a
403 CSFR error.
The weird thing is that the user is still created and the login is still
successful,
so if I tried to reload the page of the error it redirects me to the
/success page

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