Django 2.2.6 fails to serve some static files in Windows 10

My system: Windows 10 1903. Python 3.7.4, 64 bit.

My directory structure:

%USERPROFILE%/Desktop/myproject/manage.py

%USERPROFILE%/Desktop/myproject/some_app (...)

%USERPROFILE%/Desktop/myproject/myproject/db.sqlite3

%USERPROFILE%/Desktop/myproject/myproject/urls.py

%USERPROFILE%/Desktop/myproject/myproject/static (...)

%USERPROFILE%/Desktop/myproject/myproject/static/css (...)

%USERPROFILE%/Desktop/myproject/myproject/media (...)

%USERPROFILE%/Desktop/myproject/myproject/some_apps (...)

%USERPROFILE%/Desktop/myproject/myproject/settings/

%USERPROFILE%/Desktop/myproject/myproject/settings/__init__.py

%USERPROFILE%/Desktop/myproject/myproject/settings/settings_base.py

%USERPROFILE%/Desktop/myproject/myproject/settings/settings_devel.py

%USERPROFILE%/Desktop/myproject/myproject/settings/settings_production.py

My urls.py (last part):

if ENVIRONMENT=="development":

import debug_toolbar

urlpatterns += [path('__debug__/',include (debug_toolbar.urls))]

urlpatterns += static(MEDIA_URL,document_root=MEDIA_ROOT)

urlpatterns += static(STATIC_URL,document_root=STATIC_ROOT)

urlpatterns += router.urls

My settings:

STATIC_URL = '/static/'

STATIC_ROOT = os.path.join(BASE_DIR , 'static')

MEDIA_ROOT = BASE_DIR + '/media/'

(...)

MEDIA_URL='/media/'

I also tried with and without the following setting in several variants:

STATIFCILES_DIRS = ["","//",STATIC_ROOT,"%userprofile%\\Desktop\\myproject\\myproject\\"]

The template: The error happens both with  href="/static/css/styles.css" and {% load static %} (...) href="{% static css/styles.css}" . I think the template is not the problem here.

The error:"GET /static/css/styles.css HTTP/1.1" 404 1767

The error takes place also with static requests (http://127.0.0.1:8000/static/css/styles.css)

Strange behaviour: 

If I change the setting static_url to STATIC_URL = "static/" the css file is served. However, debug_toolbar ceases to serve her own static files and doesn't work anymore ("GET /myproject/static/debug_toolbar/img/ajax-loader.gif HTTP/1.1" 404 14554)

I have tried many things, to no avail.

Thank you.

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