[keycloak-user] Testing realm-mangement fine grain access control

Hello, I am testing Keycloak for deployment and one of the scenarios for adoption is the ability for some users to manage their own group membership. I've read through the Server Admin guide and it says that this functionality only available in a Technical Preview state. I've enabled the tech preview mode and have enabled Permissions for a group and now see the default scope names that appear under Groups > testgroup > Permissions (view, manage, view-membership, view-members, manage-members, manage-membership), which are part of the realm-management Authorization section. This also creates a group resource "group.resource.<goup_UUID>. I've created a User Policy for a single user and then attached that policy to the Keycloak created permission "manage.membership.permission.group.<group_UUID>" as well as the "group.resource.<group_UUID>. I've also assigned this test admin user the query-groups, query-users, and view-users realm-management client role, so in theory if this user logs into the realm admin console, they should see Groups and Users and be able to select a user and join them to the group in the realm on which I enabled permssions and set the policy. This all works, except the last bit: the "join" button is not visible in the group tab of a user that I'd like to add to my test group. Additionally, I can't manage the settings of any of the users. I have all six permissions assigned to that User Policy, but still no go. Any ideas what piece I'm missing? Thanks.