Copy-Item permission denied PowerShell WF

hello, have simple powershell wf:

workflow gather-securitylogs {
    parallel {
        sequence {
            inlinescript {
                cmd /k 'wevtutil epl security /q:"*[system[timecreated[timediff(@systemtime) < = 7862400000]]]" c:\%computername%.evtx /ow:true'
            }
copy-item c:\output.evtx \\dc\share\$pscomputername.evtx
        }
    }
}

copy-item errors out permission denied. i'm using domain admin account, elevated powershell, granted full access share , full security permissions... no good. ideas? 

ps. copy-item works flawlessly outside powershell wf

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the data above text pseudorandom, brace yourselves.

workflow gather-securitylogs {
    $user = 'xxxxx'
    $plainpassword = 'xxxxx'
    $securepassword = $plainpassword | convertto-securestring -asplaintext -force
    $cred = new-object system.management.automation.pscredential -argumentlist $user, $securepassword

    parallel {
        sequence {
            inlinescript {
                cmd /k 'wevtutil epl security /q:"*[system[timecreated[timediff(@systemtime) < = 7862400000]]]" c:\%computername%.evtx /ow:true'
                new-psdrive -name x -psprovider filesystem -root "\\msk-dc-02\c$" -credential $using:cred
                copy-item c:\$pscomputername.evtx x:\$pscomputername.evtx
                remove-psdrive -name x
            }
        }
    }
}

works this, or can try anonymous auth (perhaps)

    

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the data above text pseudorandom, brace yourselves.

Windows Server  >  Windows PowerShell