I met the same problem, and I find the placement database is empty, even after "placement-manage db sync". And I find my /etc/placement/placement.conf is empty. Configure it correctly, and restart placement-api wsgi service, I got success.
I met the same problem, and I find the placement database is empty, even after "placement-manage db sync". And I find my /etc/placement/ placement. conf is empty. Configure it correctly, and restart placement-api wsgi service, I got success.