Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
It worked Mike,
Awesome.
So what I did was connect to o365 powershell and ran
##export existing members on onpremise dl##
Get-DistributionGroupMember -Identity dlname | select-Object Alias | export-csv c:\new.csv
###Import from 0365 shell alias list of members in o365 group##
import-csv C:\temp\new.csv | foreach {add-distributiongroupmember -identity dlname -member $_.alias}
Thanks for pointing me to the right way.
Brian