Fix External Yammer Users Cannot View Images or Attachments
Question details
External Yammer guests are unable to view images or attachments in communities, despite having access to post and interact within the network.
- Product
- Microsoft Yammer
- Device & OS
- not provided
- Scenario
- External guests are collaborating in Yammer groups but cannot see attached media or files, often experiencing different results between desktop browsers and mobile apps.
- Observed behavior
- Guests can access the Yammer network and create text posts, but attached images and files appear broken or inaccessible. The issue frequently occurs on mobile apps that trigger a separate Yammer login rather than using Azure credentials.
Ensure you have administrative access to your organization's Microsoft 365 Admin Center, Azure Active Directory, and the specific SharePoint sites connected to your Yammer communities.
Verify SharePoint and Microsoft 365 Group Permissions
Images and files in Yammer are stored in a connected SharePoint library. Guests must have explicit permissions to this SharePoint site to view the attachments.
When an external user is invited to Yammer, they might get access to the community feed but lack the backend SharePoint permissions needed to load files and images.
Log into the Microsoft 365 Admin Center as an administrator. Navigate to 'Teams & groups' and ensure the external users are added as guests to the specific Microsoft 365 Group associated with the Yammer community.
Go to the SharePoint site connected to the Yammer group. Click the gear icon, select 'Site permissions', and verify that the guest users or the 'Guest' group have at least 'Read' access to the default document library.
Open the Azure Active Directory portal. Search for the affected external users and confirm they are listed as Guest users and that their invitations have been successfully redeemed.
Resolve Mobile App Authentication Conflicts
Mobile devices may prompt for a separate Yammer login, causing authentication conflicts with the Azure guest account where the permissions actually reside.
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Frequently Asked Questions
Why can external Yammer guests view text posts but not images?
Yammer stores images and attachments in a connected SharePoint document library. If external guests have access to the Yammer community feed but lack the required permissions for the underlying SharePoint site, they will be able to see text posts but not the attached media.
Does an external user need a paid Microsoft 365 subscription to view Yammer files?
No, external guests do not need a paid Microsoft 365 subscription to view shared files. However, they must be properly added to your Azure Active Directory as a guest user and explicitly granted read permissions to the relevant SharePoint library.
Why do Yammer images load on a desktop browser but fail on the mobile app?
This usually occurs due to authentication differences. The desktop browser authenticates using the user's Office or Azure guest credentials, while the mobile app might default to a separate Yammer-specific login. Re-signing into the mobile app with the correct Microsoft 365 credentials usually resolves this issue.
How do I check if a Yammer community is connected to Microsoft 365?
Navigate to the specific community's page in Yammer and look at the panel on the right side of the screen. If the community is connected, you will see Microsoft 365 resources listed, such as a SharePoint Document Library, Planner, and OneNote.
