Office.context.urls.javascriptRuntimeUrl Causes Add-in Timeout in Outlook Version 2602 (Build 19725.20190) on Current Channel

[lvantai]

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Environment

Field	Details
Platform	PC desktop
Host	Outlook
Office version	Version 2602 (Build 19725.20190)
Operating System	Windows 11

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Expected Behavior

Accessing Office.context.urls.javascriptRuntimeUrl should have no side effects. The add-in should continue to function normally, as this is a standard read-only property of the office.js API — its mere reference should not affect add-in performance or stability.

Current Behavior

The add-in times out immediately upon introduction of the single line Office.context.urls.javascriptRuntimeUrl, with no other code changes made.

This regression does not reproduce on:

• Version 2508 (Build 19127.20264)
• Monthly Enterprise Channel Version 2602 (Build 19725.20170) — same major version, different build number

This strongly suggests the issue was introduced in a specific update within the Current Channel.

Steps to Reproduce

1. Clone the official Microsoft spam-reporting sample:
   https://github.com/OfficeDev/Office-Add-in-samples/blob/main/Samples/outlook-spam-reporting
2. Run the add-in as-is to confirm it works correctly out of the box.
3. Add the following single line anywhere in the add-in code:

   Office.context.urls.javascriptRuntimeUrl

4. Reload and run the add-in in Outlook Version 2602 (Build 19725.20190).
5. Observe that the add-in times out immediately.

Link to Live Example(s)

• Base sample: https://github.com/OfficeDev/Office-Add-in-samples/blob/main/Samples/outlook-spam-reporting

Context

This issue is blocking development of an Outlook spam-reporting add-in that relies on Office.context.urls.javascriptRuntimeUrl as part of its runtime logic. Since Office.context.urls is owned and maintained by Microsoft as part of the office.js library, we believe this is an unintended regression introduced in Build 19725.20190. We are requesting confirmation of whether this is a known issue and whether any workaround is available in the meantime.

Useful Logs

• Screenshots

[github-actions]

Here are some similar issues that might help you. Please check if they can solve your problem.

• Office.context.urls is null in the JavaScript runtime in Classic Outlook (current channel) #6592

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[JuaneloJuanelo]

duplicate of #6592