application not recognized as URL namespace

In my root url, I have:

url(r'^authentication/', include('authentication.urls')),

in authentication/urls.py, I have no app_name declared.

In a module in authentication, I have

from django.core.urlresolvers import reverse

from django.apps import apps
print('authentication installed? ' + str(apps.is_installed('authentication')))

reverse('authentication:password_change',urlconf='authentication.urls')

and receive
django.core.urlresolvers.NoReverseMatch: 'authentication' is not a registered namespace
while the above debug print gives
authentication installed? True

What am I doing wrong here?

Please advice,
Axel
—
PGP-Key:29E99DD6 ☀ +49 160 9945 7889 ☀ computing @ chaos claudius

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