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Fix Data-Loading Error for Quarantined Messages in On-Premises Shared Mailbox
Question details
The user is unable to review quarantined emails in an on-premises shared mailbox due to a persistent data-loading error.
- Product
- Microsoft Exchange / Microsoft 365
- Device & OS
- not provided
- Scenario
- Attempting to manage, review, and release quarantined messages within a shared mailbox environment.
- Observed behavior
- The user successfully releases messages from cloud-based shared mailboxes but receives a data-loading error for shared mailboxes hosted in an on-premises environment.
Ensure you have global administrator or security administrator access to the Microsoft 365 Defender portal, as standard users cannot bypass this cross-premises system limitation.
Manage Quarantined Messages via Administrator Workflows
Since direct end-user access to on-premises shared mailbox quarantine is unsupported, administrators must manage and release these messages centrally.
Reviewing quarantined messages for shared mailboxes hosted in an on-premises environment is currently unsupported by Microsoft. This is a known cross-premises product architecture limitation, not an issue with user permissions or an account glitch.
To resolve this, standard users must request their IT administration team to locate and release the blocked emails through the centralized security portal.
Navigate to the Microsoft 365 Defender portal using an account with administrator privileges.
In the left navigation pane, go to 'Email & collaboration' and select 'Review', then click on 'Quarantine'.
Use the search bar and filter tools to locate quarantined messages specifically sent to the affected on-premises shared mailbox address.
Select the legitimate messages, carefully review their contents, and click 'Release' to deliver them directly to the shared mailbox inbox.
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Frequently Asked Questions
Why do I get a data-loading error when checking quarantined messages?
This error occurs specifically when trying to access quarantined items for a shared mailbox hosted in an on-premises environment. It is a known cross-premises limitation in Microsoft's architecture, not a glitch with your account or device.
Can I fix the cross-premises limitation by changing user permissions?
No. Assigning higher permissions to the end-user will not resolve the data-loading error. The restriction is at the product tier level, meaning only an IT administrator managing it from the central quarantine center can bypass the limitation.
How can we receive our quarantined emails without direct user access?
Your organization's IT administrator must log into the Microsoft 365 Defender portal, locate the quarantined messages sent to the on-premises shared mailbox, and manually release them to the inbox on behalf of the users.
Does this limitation affect cloud-hosted shared mailboxes?
No, users with the correct delegation permissions can successfully review and release quarantined messages from shared mailboxes that are fully hosted in the cloud. The issue only impacts on-premises deployments.
