Exchange 365 Resource shows Send on behalf GUID instead of user name

James (Jim) Terryberry 0 Reputation points

We are an Exchange hybrid deployment and this user was synced from on-premises.

We're setting up a Resource/Room in Exchange 365 Admin center.  We have one user that we're trying to give "Send on Behalf" permission and instead of her email address her GUID is showing up instead. 

- Her normal email address shows up in "send as" and "full access"
- GUID shows up when we try to give her send on behalf permissions in other resources
- She is unable to send emails on behalf of that resource as Outlook doesn't recognize her permission.
- all other users appear as their email address in Send on behalf. It's just her and just that permission area.
- GUID appears using Admin Center GUI and with powershell

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Jarvis Sun-MSFT 10,091 Reputation points Microsoft Vendor

    Hi @James (Jim) Terryberry ,

    Thanks for posting in our Q&A forum.

    This is a predictable phenomenon. According to this blog:

    We’ll use this GUID as Name instead of synchronizing the Name from on-premises (when in Hybrid environment) or using the alias (if Name is not specified) to compute the Name parameter in Exchange Online.

    You’ll need a roundtrip to PowerShell and use the Get-Recipient cmdLets to obtain the DisplayName of the GUID shown in your mailbox permissions, such as:

    Get-Recipient 860047a6-a9bc-4d63-8d6f-XXXX).DisplayName

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