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How to Fix Viva Engage Community Posting and Attachment Errors

Kushani Nimanthika Oct 10, 2026 870 views

Question details

Community administrators are unable to post messages or upload attachments in specific Viva Engage communities.

How to Fix Viva Engage Community Posting and Attachment Errors

Product: Microsoft Viva Engage
Device & OS: not provided
Scenario: Attempting to post updates, share messages, or upload image attachments within a Viva Engage (formerly Yammer) community.
Observed behavior: The system returns an error preventing the user from posting or uploading files. This typically happens in communities that have not been migrated from legacy private, unlisted Yammer groups.

Before you start

Ensure you have Microsoft 365 Global Administrator or Viva Engage Network Administrator privileges, as resolving this issue requires tenant-level configuration changes.

Solution 1Recommended

Migrate Microsoft 365 Tenant to Native Mode

Upgrading your tenant to Native Mode connects Viva Engage communities to Microsoft 365 services, which restores the ability to post messages and upload attachments.

Viva Engage requires communities to be connected to Microsoft 365 to fully support modern file storage and attachment features via SharePoint. Legacy unlisted groups that have not been migrated will often face posting and upload restrictions.

Before migrating, ensure that all unlisted communities are converted to either standard private or public groups.

Access Viva Engage Admin Center

Sign in to your Microsoft 365 admin center, navigate to the Viva Engage (Yammer) admin settings as a network administrator.

Open the Alignment Tool

Locate and open the Native Mode alignment tool within the admin settings menu.

Review Prerequisite Report

Generate and download the alignment report. Address any unlisted groups by changing their privacy settings to either public or private.

Initiate Migration

Once all prerequisites are met, click the button to start the migration to Native Mode. Wait for the process to complete, which will restore posting functionality across all communities.

Migration Complete: After the tenant is successfully migrated to Native Mode, all files and attachments will be routed through SharePoint, eliminating the previous upload errors.

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Frequently Asked Questions

Why do image attachments fail to upload in my Viva Engage community?

Attachment uploads often fail if the community is not properly connected to Microsoft 365 services or if the tenant has not been migrated to Native Mode, which handles file storage via SharePoint.

Who can perform the Native Mode migration for Viva Engage?

Only a Microsoft 365 Global Administrator or a designated Viva Engage Network Administrator has the necessary permissions to access the alignment tool and run the migration.

What happens to unlisted Yammer groups during migration?

Unlisted groups are not supported in Native Mode. You must change their privacy settings to standard private or public before the migration process can successfully complete.

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