First create universal group and add users to the group the mail enable it
With the following command from the exchange PowerShell
Enable-DistributionGroup -Identity “groupName”
After its enabled
Run the following command
send on behalf off
(run the command from the exchange powershell)
Set-MailPublicFolder “\publicfoldername” -GrantSendOnBehalfTo “Groupname”
send as
For the send as go to properties of the distribution group from the ECP schange link then go to delivery options
Add the group
Microsoft Systems, Cloud and azure professionals 
is this possible to create universal group and add o365 user in the group after mail enable on this group add group in on promises functional mail
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the topic is talking about public folders cross permissions
also you must know the syn direction in most cases the syn is from the AD to the cloud so if you add and users to o365 groups or members it wont be synced to the on-prem
did I reply to you or you need more help
any way you can send me on karim.zaki@profadmins.com
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