Hi @Kaue Mendes | KLA ,
Thanks for posting in our Q&A forum.
For the hybrid environment, we can synchronize distribution groups to the cloud with AAD. In this case, however, these groups need to be managed from on-premises.
If you want to manage these groups only from O365, you have to re-create distribution groups in the cloud manually. Then add the membership, x500 addresses, then remove the on-premises groups. You can check these blogs for more details:
Migrate Distribution Groups from Exchange On-Premise to Exchange Online,
Migrating Distribution Groups to Office 365.
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