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How to Resolve the This add-in has been disabled to help keep you safe Error

For users of the Email Sidebar on:


1 min read


The issue manifests in the following manner: you see the following notification on RGES Add-In opening in MS Outlook on the Web for MS Exchange On Premises, e.g., and cannot proceed.

Opening RG Email Sidebar Add-in in Outlook on the Web results in the following error message:

This add-in has been disabled to help keep you safe. To continue using the add-in, validate that this item is hosted in a trusted domain or open it in the Office desktop app.


This error is caused by a security update implemented by Microsoft.

To resolve the issue:

Update your MS Exchange mail server with the latest Security Updates that were released after October 13, 2020. All later updates include the changes required for the Add-In to start normally.

See this Microsoft article for more information.



Also see the following articles:

“Need Admin Approval” troubleshooting

RG Email Sidebar mass deployment scenarios

How RG Email Sidebar works with EWS

Microsoft Consent framework

Microsoft App Consent Experience



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