root location of Flask app returns 403 on nginx server

I've seen other posts say that either file permissions or the lack of an index directive are the cause. However, my Flask application does not have an index file at all, and most of the site works like a charm.

nginx.conf

server {
    listen      80;
    server_name localhost;
    charset     utf-8;
    client_max_body_size 5M;
    root /srv/www/cc/app;

    location / { 
        try_files $uri $uri/ @cc; 
    }
    location /uploads/ {
#       root /srv/www/cc/app;
        expires max;
    }
    location /static/ {
#       root /srv/www/cc/app;
        expires max;
    }
    location @cc {
        include uwsgi_params;
        uwsgi_pass unix:/tmp/uwsgi.sock;
    }
}

snippet from views.py

@app.route('/', methods = ['GET'])
def client():

    return render_template("/client/index.html")


#-----------------CLIENT ABOVE, ADMIN BELOW------------------#


@app.route('/admin/', methods = ['GET'])
@login_required
def admin():

    submissions = Campaign.query.all()

    return render_template("admin.html",
        title = 'Admin',
        submissions = submissions)

So I basically have a single views.py with a ton of routes. All the ones which are /admin/ work like a charm, but the one which is just /, doesn't.

As I said, I do not have an index. I tried setting the index directive in nginx.conf to "app" as that's where the magic happens... but no dice.

Here's my file structure:

/cc/
    app/
        __init__.py
        views.py
        etc
        uploads/
        static/
    config.py

From the nginx logs:

directory index of "/srv/www/cc/app/" is forbidden

I've found similar issues from other folks online and I've verified that nginx runs with user www-data, and that this use is owner of the directory.