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

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Overview

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. outlook.office.com, 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.

Resolution

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.

See also