Certificate Information Exported to CSV is Empty using Different Credential - arrays

Question

I have an array that I write certificate information into using a credential called $array_otheruser but when I try to Export-Csv, the file becomes empty.
However, it writes fine if my export line is within the $ScriptBlock. However, I want to export it out of scriptblock, is this possible?
The code below writes an empty file:
[string][ValidateNotNullOrEmpty()]$passwd = "password"
$secpasswd = ConvertTo-SecureString -String $passwd -AsPlainText -Force
$mycreds = New-Object Management.Automation.PSCredential ("username", $secpasswd)
$array_otheruser = #()
$CSVFile = "c:\temp\temp9.csv"
$Certs = Get-ChildItem Cert: -Recurse
[ScriptBlock]$ScriptBlock = {
$Certs | where {
$_.PsIsContainer -eq $false
} | ForEach-Object ({
$obj | Add-Member -MemberType NoteProperty -Name "NotAfter" -Value $_.NotAfter
$obj | Add-Member -MemberType NoteProperty -Name "NotBefore" -Value $_.NotBefore
$array_otheruser += $obj
$obj = $null
})
}
$otheruser = Invoke-Command -ScriptBlock $ScriptBlock -ComputerName $env:computername -Credential $mycreds | Wait-Job
$otheruser | Receive-Job
$array_otheruser | Export-Csv -Path $CSVFile -NoTypeInformation
The code below writes into the file (where I've put the Export-Csv inside the scriptblock):
[ScriptBlock]$ScriptBlock = {
...
$array_otheruser += $obj
$obj = $null
})
##########This is the key difference, the export line is inside the ScriptBlock
$array_otheruser | Export-Csv -Path "c:\temp\temp9.csv" -NoTypeInformation
########
}
$otheruser = Invoke-Command -ScriptBlock $ScriptBlock -ComputerName $env:computername -Credential $mycreds | Wait-Job
$otheruser | Receive-Job
I would like to know if it is possible to have the Export-Csv file line outside of the scriptblock and have the cert information contents populate as it should using a different credential.