Send on Behalf on hybrid domain

Carlos Amaral 0 Reputation points
Greetings to all!
A debt:
I have a hybrid domain.
On the Azure side, I have a distribution list that contains 2 members.
Both members are created in the "On-premises" domain, synchronized to Azure.
The difference is that one of them has the mailbox in Azure (Mailbox Type: Office 365), and the other has the mailbox in the "On-prem" domain (Mailbox Type: User).
Both have rights to send on behalf of the list, but only the one with the mailbox in Azure can send on behalf of the list, the other always gives an error with no sending permission.
Is there a solution for this?
Thanks to anyone who can help!
Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Bruce Jing-MSFT 1,615 Reputation points Microsoft Vendor

    Hi,@Carlos Amaral

    Thanks for posting your question in the Microsoft Q&A forum.

    Based on your description, you have a hybrid environment where users are synced to Azure, the member in Azure can send on behalf, the user locally cannot, and both members have rights to send on behalf.

    Referring to the official Microsoft documentation,some changes are needed on your Microsoft Entra Connect server for Send on Behalf permissions to sync between your on-premises Exchange servers and Exchange Online.

    A screenshot of a computerDescription automatically generated

    You can refer to this URL for details:  Permissions in Exchange hybrid deployments | Microsoft Learn

    If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.

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