How to add Distribution Group email alias from CSV in office 365

Hello Forum!

Hope someone can help me troubleshoot this or even let me know if its not possible. But, I used powershell to import distribution groups and set primary emails in Office 365. That worked great, but we have two domains and i would like to add an email alias to all my DGs for the other domain.

This was my best attempt and its not going well:

Import-CSV "C:\distributionlists.csv" | foreach {Set-DistributionGroup "$_.Name" -EmailAddresses SMTP:$_.PrimarySmtpAddress,$SecondarySmtpAddress}

$_.Name is the column name for my DGs. IE: DL-IT

$_.PrimarySmtpAddress is the column name for my primary email. IE: IT@domain01.com

$_.SecondarySmtpAddress is the column name for my email alias. IE: IT@domain02.com