When adding new Elytron policy resource, it might fail with error message in [1]. In comment [2] it is explained why it is expected. This behavior needs to be documented as it can be confusing for users. Please contact mstefank (who knows far more than I do) for further information.

[1]

[standalone@localhost:9990 /] /subsystem=elytron/policy=foo:add()
{
    "outcome" => "failed",
    "failure-description" => "WFLYELY01023: Could not find policy provider with name [foo]",
    "rolled-back" => true
}

[2] https://issues.jboss.org/browse/JBEAP-11826?focusedCommentId=13457896&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-13457896