Невозможно пройти аутентификацию в Django

Я реализовал свою модель CustomUser и, насколько я понял, мне нужно переопределить метод аутентификации. Я сделал это, но моя форма входа всегда возвращает сообщение "неверный логин/пароль". Форма регистрации работает нормально, мои новые аккаунты появляются в базе данных. Кстати, я пытался добавить функцию print в метод аутентификации бэкенда, но она ничего не выводит

setting.py

AUTHENTICATION_BACKENDS = ['account.forms.CustomBackend']
AUTH_USER_MODEL = 'account.CustomUser'

Я использую встроенную Django LoginForm

urls.py

    path('login/', LoginView.as_view(template_name='login.html', authentication_form=CustomLoginForm), name='login'),

models.py

from django.contrib.auth.models import AbstractUser, BaseUserManager
from django.db import models
from django.utils.translation import ugettext_lazy as _


class CustomUserManager(BaseUserManager):
    """Define a model manager for User model with no username field."""

    def _create_user(self, email, password=None, **extra_fields):
        """Create and save a User with the given email and password."""
        if not email:
            raise ValueError('The given email must be set')
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password=None, **extra_fields):
        extra_fields.setdefault('is_staff', False)
        extra_fields.setdefault('is_superuser', False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password=None, **extra_fields):
        """Create and save a SuperUser with the given email and password."""
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)

        if extra_fields.get('is_staff') is not True:
            raise ValueError('Superuser must have is_staff=True.')
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')

        return self._create_user(email, password, **extra_fields)

class CustomUser(AbstractUser):
    username = None
    first_name = None
    last_name = None
    # first parameter is for a console registration
    firstname = models.CharField(_('First name'), max_length=32, default='')
    lastname = models.CharField(_('Last name'), max_length=32, default='')
    patronymic = models.CharField(_('Patronymic'), max_length=32, default='')
    email = models.EmailField(_('Email address'), unique=True)
    
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['firstname', 'lastname', 'patronymic']

    objects = CustomUserManager()

forms.py

from django.contrib.auth import get_user_model
from django.contrib.auth.forms import AuthenticationForm, UserCreationForm
from django.forms.widgets import PasswordInput, TextInput
from django.contrib.auth.backends import ModelBackend
from .models import CustomUser
from django import forms

class RegistrationForm(UserCreationForm):
    firstname = forms.CharField(widget=TextInput(attrs={
        'placeholder': 'Ім\'я'
    }))
    lastname = forms.CharField(widget=TextInput(attrs={
        'placeholder': 'Прізвище'
    }))
    patronymic = forms.CharField(widget=TextInput(attrs={
        'placeholder': 'По-батькові'
    }))
    email = forms.CharField(widget=TextInput(attrs={
        'placeholder': 'Електронна адреса'
    }))
    password1 = forms.CharField(widget=PasswordInput(attrs={
        'placeholder': 'Пароль'
    }))
    password2 = forms.CharField(widget=PasswordInput(attrs={
        'placeholder': 'Повторіть пароль'
    }))

    class Meta:
        model = CustomUser
        # you should show all fields added in you model
        fields = ['firstname', 'lastname', 'patronymic', 'email', 'password1', 'password2']

class CustomLoginForm(AuthenticationForm):
    email = forms.CharField(widget=TextInput(attrs={
        'placeholder': 'Електронна адреса'
    }))
    password1 = forms.CharField(widget=PasswordInput(attrs={
        'placeholder': 'Пароль'
    }))

    class Meta:
        model = CustomUser
        fields = ['email', 'password1']

class CustomBackend(ModelBackend):
    def authenticate(self, request, email=None, password=None, **kwargs):
        model = get_user_model()
        try:
            user = CustomUser.objects.get(email=email)
        except CustomUser.DoesNotExist:
            return None
        else:
            if user.check_password(password):
                return user
        return None

login.html

{% extends 'base/base.html' %}
{% load static %}
{% block title %}Login{% endblock %}

{% block content %}
<link rel="stylesheet" href="{% static 'form.css' %}">
<div class="authorization-wrapper">
    <form class="authorization-form" method="post">
        <h1>Вхід</h1>
        <br>
        {% csrf_token %}
        <p class="authorization-field">{{ form.email }}</p>
        <br>
        <p class="authorization-field">{{ form.password1 }}</p>
        <br>
        {% if form.errors %}
            <p class="authorization-error">Incorrect email or password</p>
            <br>
        {% endif %}
        <button class="authorization-button" type="submit">Увійти</button>
        <br><br>
        <p>Немає аккаунту?<a class="authorization-question" href="{% url 'register' %}"> Створити</a></p>
    </form>
</div>

{% endblock %}

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