Comment 0 for bug 1775224

The setup with xenial + Queens UCA and 18.02 charms is as follows:
https://paste.ubuntu.com/p/BQn3JHr5yZ/

adma and admb are users with Admin role granted on their respective domain level so they can manage users, groups and roles due to how policy rules shipped via charms are structured http://paste.ubuntu.com/p/ybpvMsmWHC/
    "identity:create_user": "rule:cloud_admin or rule:admin_and_matching_user_domain_id",

While it is possible to do CRUD on users from CLI, e.g. adma user can create new users in domain a, there is no visible way to do that from the dashboard for create and delete operations ("edit" dropdowns are visible, see the screenshot).

A user with an admin-project/domain scoped token has that ability and sees all necessary buttons (https://specs.openstack.org/openstack/keystone-specs/specs/mitaka/is_admin_project.html, see
https://github.com/openstack/keystone/blob/stable/queens/keystone/conf/resource.py#L59-L77)

The problem does not seem to be related to oslo.policy directly (policy files seem to be correct) - just to how horizon handles domain administrators.

It is possible to create users from the dashboard without using a button by directly invoking the modal window via accessing the right URL directly: http://<horizon-address>/identity/users/create/ (see the screenshot below). Filling out the form and submitting it results in a successful creation of a new domain user.