Exchange 2007, migrate to Office 365, hidden distribution groups didnt come over

We already did the batch to export mailboxes and it is done and continues to sync. Of course, it pulled distribution groups that were NOT marked as hidden. What we didn't know is that it would ignore and not pull distribution groups that ARE marked as hidden. We don't want to redo the entire batch due to time constraints, so is there any other way to deal with getting the hidden groups (and members of those groups) in there aside from manually entering them into Office 365?
pkromerAsked:
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Vasil Michev (MVP)Commented:
For starters, what kind of migration did you perform? Cutover? Most methods offer the ability to "redo", but for others there will be errors generated because of duplicate objects.

If you plan to use dirsync/AAD Connect to keep the on-prem and O365 objects in sync, it will recreate any missing DLs. Or you can use some PowerShell script to get the list of groups and their membership and recreate them in O365.

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pkromerAuthor Commented:
Thanks. We aren't yet using or even setting up dirsync/AAD Connect, but we may in the future. We are doing a cutover migration, and will probably go with what you suggest with PowerShell and recreate them in O365.

We just tried to do that with transport rules and import the transport rules into O365 from an xml file, but it errors on "cannot be used with engine based xml import". Ideas?
Todd NelsonSystems EngineerCommented:
Are these dynamic distribution groups or standard distribution groups?  Dynamic ones definitely are not migrated whether hidden or not.

This article alludes to the fact that if not visible in the GAL they are not migrated for cutover migrations ... https://technet.microsoft.com/en-us/library/jj898490%28v=exchg.150%29.aspx
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