Looking for logging into the Django Form Not Valid site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Django Form Not Valid site. After that you can login as usual with your login credentials.
https://stackoverflow.com/questions/7297980/django-login-failing
https://stackoverflow.com/questions/45824046/djangos-authentication-form-is-always-not-valid?rq=1
https://stackoverflow.com/questions/39615504/django-login-form-returning-false-on-is-valid-if-username-already-exists?rq=1
https://www.reddit.com/r/django/comments/7gjeb6/why_does_django_say_my_login_form_is_invalid_how/
https://medium.freecodecamp.org/user-authentication-in-django-bae3a387f77d
https://code.djangoproject.com/ticket/9803
https://docs.djangoproject.com/en/2.1/topics/auth/default/
https://djangobook.com/form-validation/
https://tutorial.djangogirls.org/en/django_forms/
http://www.dcs.gla.ac.uk/~leif/di/tutorial/login.html
https://docs.djangoproject.com/en/2.1/topics/auth/customizing/
https://docs.djangoproject.com/en/1.8/_modules/django/contrib/auth/forms/
https://simpleisbetterthancomplex.com/tutorial/2016/06/27/how-to-use-djangos-built-in-login-system.html