Excel.SensitivityLabelUpdateStatus renamed from Excel.SensitivityLabelUpdateResult in Office.js beta (undocumented API)
UndocumentedNot in Microsoft's documentation
Excel.SensitivityLabelUpdateStatus, not in Microsoft's documentation, renamed from Excel.SensitivityLabelUpdateResult on the Office.js beta CDN in 16.0.20606.15070, first seen 14 Oct 2026, 20:07 UTC. Affects Excel on Mac, web, Windows, Android and iOS. Not changed in production so far.
- Production
- No change seen on the production CDN.
- Beta
- added in 16.0.20606.15070, first seen 14 Oct 2026, 20:07 UTC; rollout complete 16 Oct 2026, 04:50 UTC.
What this means for your add-in
On clients that load the new build, Excel.SensitivityLabelUpdateResult is undefined: calling or constructing it throws a TypeError (the messages are below).
Use Excel.SensitivityLabelUpdateStatus, with a fallback to the old name for clients still on the previous build.
It is not in Microsoft's documentation (neither @types/office-js nor @types/office-js-preview): an internal API that can change in any build. Do not depend on it; if you must, check that it exists before use — if (Excel.SensitivityLabelUpdateResult) { … }.
So far this is only on the beta CDN (/lib/beta/hosted/). Add-ins that load production Office.js (/lib/1/hosted/) are not affected yet; production builds often follow beta.
Errors you may see
In the add-in's console or error logs, on clients that loaded the new build. Parts in <…> come from your own code.
TypeError: Cannot read properties of undefined (reading '<value>')Windows, web, Android (Chromium)TypeError: undefined is not an object (evaluating 'Excel.SensitivityLabelUpdateResult.<value>')Mac, iOS (Safari)
Change history
Changed in the same rollouts
- Excel.AllowedUrls added
- Excel.Copilot added
- Excel.EntityCardLayoutType enum values
- Excel.SensitivityLabelAbacAttribute removed
- Excel.SensitivityLabelAbacAttributeValue removed
- Excel.SensitivityLabelUpdateResult removed
- Excel.UserActivityType enum values
- PowerPoint.SensitivityLabelAbacAttribute removed
- PowerPoint.SensitivityLabelAbacAttributeValue removed
- PowerPoint.SensitivityLabelUpdateStatus renamed
Source
silentship samples every Office.js file on the CDN every 10 minutes and compares the public API surface of each new build with the previous one by reflection. This page lists what changed for Excel.SensitivityLabelUpdateStatus; it does not include Microsoft's code. The API status comes from Microsoft's published type definitions (@types/office-js and @types/office-js-preview). Excel.SensitivityLabelUpdateStatus is not in Microsoft's documentation.