Fix Microsoft 365 Group Delivery Management Showing GUIDs or Failing
Question details
Administrators are experiencing issues where Microsoft 365 Group delivery management displays GUIDs instead of usernames or fails entirely, preventing the addition or removal of group members.
- Product
- Microsoft 365 (Exchange Online)
- Device & OS
- not provided
- Scenario
- Administrators attempting to manage delivery settings and modify membership for Microsoft 365 Groups.
- Observed behavior
- The delivery management interface shows GUIDs instead of user display names, and administrators cannot successfully add or remove group members.
Ensure you have Exchange Administrator or Global Administrator privileges in Microsoft 365, and that you have access to connect to Exchange Online PowerShell.
Identify and Resolve Duplicate Users via Exchange Online PowerShell
Use Exchange Online PowerShell to locate and remove conflicting MailUser or guest accounts with identical display names that disrupt group management.
Duplicate display names between standard user accounts, guest accounts, and MailUser objects in Exchange Online can cause the directory to malfunction, resulting in GUIDs being displayed or management actions failing.
Open PowerShell as an administrator and connect to Exchange Online using your Microsoft 365 administrative credentials.
Execute the command: Get-Recipient -Filter { DisplayName -eq "<user display name>" } (replacing the placeholder with the actual problematic user's name).
Review the output to check if multiple recipients (such as a guest account and a MailUser) share the exact same display name.
Delete or rename the conflicting MailUser or duplicate guest account from your directory to resolve the conflict.
Wait for the directory changes to synchronize, then attempt to manage the Microsoft 365 Group delivery settings again.
Verify User Provisioning in Microsoft Entra ID
Check Microsoft Entra ID for provisioning issues, proxy address conflicts, or incorrect LegacyExchangeDN values.
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Frequently Asked Questions
Why am I seeing a GUID instead of a username in Microsoft 365 Group delivery management?
This typically occurs when there is a duplicate display name in your directory, such as a guest account and a MailUser sharing the same name, or due to Microsoft's underlying updates to user naming conventions.
How do I find a user's display name conflicts in Exchange Online?
You can find conflicts by connecting to Exchange Online PowerShell and running the command: Get-Recipient -Filter { DisplayName -eq "<user display name>" }.
What should I do if removing duplicate users doesn't fix the group delivery management issue?
If resolving Entra ID and Exchange Online duplicates does not restore administrative functionality, an organization administrator should open a direct support request with Microsoft 365 support from the admin center.
