Find the following files in /etc/openstack-dashboard.

The keystone_policy.json file defines additional access controls for the dashboard that apply to the Identity service. The keystone_policy.json file must match the Identity service /etc/keystone/policy.json policy file.

The nova_policy.json file defines additional access controls for the dashboard that apply to the Compute service. The nova_policy.json file must match the Compute /etc/nova/policy.json policy file.