network sideload fails but npm run start sideload works

[duane-j-wagner]

Provide required information needed to triage your issue

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: PC and Web
• Host [Excel, Word, PowerPoint, etc.]: Excel
• Office version number: ___Microsoft® Excel® for Microsoft 365 MSO (Version 2410 Build 16.0.18129.20200) 64-bit ___
• Operating System: Windows 11 Enterprise__
• Browser (if using Office on the web): Edge

Expected behavior

The add in should be initialized on install, causing the custom contextual tab and the task pane to show.

Current behavior

The add-in does nothing on a network share install on a PC, nor when uploaded on Web. The custom contextual tab remains hidden and the task pane does not show.
if the OverriddenByRibbonApi tag in the manifest is set to false, the add-in installs and initializes as expected.
The whole point of that tag is to hide the control that should only be shown when overriding the control is not supported, so setting to false leads to a poor user experience.
Mac side-loading works as expected. npm run start side-loading also works on PC.

Steps to reproduce

1. On PC, follow instructions to side-load the manifest file
2. Select the add-in in this Excel spreadsheet and push Add to install

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Link to live example(s)

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Provide additional details

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Context

We need to side load in order for QA to test on PC and Web. Side-loading works on Mac.

Useful logs

• Console errors
• Screenshots
• Test file (if only happens on a particular file)
  The onReady() method never gets called and there are no errors. Excel shows a status at the bottom of window that the add-in was installed successfully.

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[RuizhiSunMS]

Mark it as #9642233 into our backlog