Greg,
Here's the rundeck.audit.log that I captured when I click setup button for scm plugin:
2015-12-04 14:53:53,315 - Evaluating Decision for: res<type:resource, kind:project> subject<Username:admin Group:architect Group:admin Group:deploy Group:build Group:user> action
<create> env<
http://dtolabs.com/rundeck/env/application:rundeck>: authorized: true: GRANTED, reason: GRANTED, evaluations: ACLRule</etc/rundeck/admin.aclpolicy[2][type:resou
rce][rule: 1]>{'Admin, all access.' context={application='rundeck'} type='resource' for: { group='admin'} allow=[*]} GRANTED for action create => GRANTED (0ms)
2015-12-04 14:53:53,394 - Evaluating Decision for: res<type:adhoc> subject<Username:admin Group:architect Group:admin Group:deploy Group:build Group:user> action<run> env<http://
dtolabs.com/rundeck/env/project:dreambox-west>: authorized: true: GRANTED, reason: GRANTED, evaluations: ACLRule</etc/rundeck/admin.aclpolicy[1][type:adhoc][rule: 1]>{'Adm
in, all access.' context={project='.*'} type='adhoc' for: { group='admin'} allow=[*]} GRANTED for action run => GRANTED (0ms)
2015-12-04 14:53:53,395 - Evaluating Decision for: res<type:adhoc> subject<Username:admin Group:architect Group:admin Group:deploy Group:build Group:user> action<run> env<http://
dtolabs.com/rundeck/env/project:dreambox-west>: authorized: false: No context matches subject or environment => REJECTED_NO_SUBJECT_OR_ENV_FOUND (0ms)
2015-12-04 14:53:53,472 - Evaluating Decision for: res<type:project, name:dreambox-west> subject<Username:admin Group:architect Group:admin Group:deploy Group:build Group:user> a
ction<configure> env<
http://dtolabs.com/rundeck/env/application:rundeck>: authorized: true: GRANTED, reason: GRANTED, evaluations: ACLRule</etc/rundeck/admin.aclpolicy[2][ty
pe:project][rule: 1]>{'Admin, all access.' context={application='rundeck'} type='project' for: { group='admin'} allow=[*]} GRANTED for action configure => GRANTED (0ms)