Authentication Django login returns 405 after logging in

Question

The login page after being filled should redirect to the page that requires authentication but returns in the console "POST /login/ HTTP/1.1" 405 0 and in the browser returns to blank login page.

I’m using Django’s User table.
The registration page saves the email name and password, the login screen uses these fields to access I set up Settings that way:

AUTHENTICATION_BACKENDS = [

'django.contrib.auth.backends.ModelBackend',
]
LOGIN_URL = 'login'
LOGIN_REDIRECT_URL ='bemvindo'
LOGOUT_URL ='logout'
LOGOUT_REDIRECT_URL = 'login'

Based View Class:

class Acessar(TemplateView):
    template_name = 'login.html'



class Welcome(LoginRequiredMixin,TemplateView):
    template_name = 'welcome.html'

py urls.py left that way:

from django.urls import path
from  django.contrib.auth import views as autentificacao

    from .views import FormularioViews, Acessar, Welcome
    urlpatterns= [
        path('', FormularioViews.as_view(), name='registrar'),
        path('login/', Acessar.as_view(), name='login'),
        path('logout/', autentificacao.LogoutView.as_view(), name='logout'),
        path('welcome/', Welcome.as_view(), name='bemvindo'),
    ]

In the browser developer tool indicates this message :

Failed to load Resource: the server responded with a status of 405 ()

What is missing in the database is as is_staff true.

html:

<form method="post">
     {% csrf_token %}
<div class="login">
                <input type="text" placeholder="username"  id="id_username" name="username"><br>
                <input type="password" placeholder="password"  name="password" id="id_password"><br>
                <input type="submit" value="Login">
        </div>
    </form>