Registering existing and new users works, but is ephemeral.

urls.py

@@ -168,6 +168,7 @@ trogglepatterns = [
 #   NB setting url pattern name to 'login' instea dof 'expologin' with override Django, see https://docs.djangoproject.com/en/dev/topics/http/urls/#naming-url-patterns
     path('accounts/logout/',   expologout, name='expologout'), # same as in django.contrib.auth.urls
     path('accounts/login/',    expologin,  name='expologin'),  # same as in django.contrib.auth.urls
+    path("accounts/register/<slug:username>", register,   name="re_register"),
     path("accounts/register/", register,   name="register"),
     path('accounts/', include('django.contrib.auth.urls')),  # see site-packages\registration\auth_urls_classes.py