Comment 10 for bug 1568825

The fix was introduced in commit https://github.com/openstack/puppet-heat/commit/48b80077e83203c2dc40894e3adc6f3bd1ac170d

Unfortunately, it was not included in 8.0 Release ISO, however it was pushed to updates.

$ git tag --contains 48b80077e83203c2dc40894e3adc6f3bd1ac170d
8.0.0
8.1.0
8.2.0
9.0.0
9.1.0

Please install the latest updates (https://docs.mirantis.com/openstack/fuel/fuel-8.0/maintenance-updates.html#mu8-0-how-to-update)

OR

fix /etc/heat/heat.conf manually by adding in [trustee] section (http://docs.openstack.org/liberty/install-guide-rdo/heat-install.html#install-and-configure-components)