For we don't use Distribution Groups the exchangegroup.csv exported with the PowerShell Sync Script 4.2 will be blank.
We make use of the Office 365 groups (Microsoft Teams). And we do have one Dynamic Distribution Group, but this one isn't seen by the Get-DistributionGroup cmdlet.

Is there a way to use Office 365 groups or Dynamic Distribution Group as input for Retain O365 module?
At this moment the Dynamic Distribution Group is most important, because this contains users, all other such as rooms, equipment is excluded.