displayDialogAsync fails randomly on Windows (never seen on MacOs)

[ahthomsen]

Summary:
For users on Windows, we receive ongoing feedback that our add-in randomly fails to load when a dialogue view is opened. The issue happens randomly and only with some users.

Sometimes an error is shown like below:

In other cases, the window just remains blank.

We have confirmed that the issue also remains if the application simply loads a single string "blank." (no HTML, JavaScript, or anything else).

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: PC desktop (Windows)
• Host [Excel, Word, PowerPoint, etc.]: PowerPoint
• Office version number: Version 2501
• Operating System: Windows 11 Pro, 24H2
• Browser (if using Office on the web): n/a

Expected behavior

No errors and a consistent experience.

Current behavior

With some users, the error takes place in 1-2% of cases, while for others, it is more like 10% of cases

Steps to reproduce

Office.context.ui.displayDialogAsync(
fullUrl,
{
height: size,
width: size,
displayInIframe: inFrame,
},

Using only URLs from the same domain as the host application

Link to live example(s)

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Provide additional details

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Context

Only fails on PC, seems like it mainly happens when larger presentations are opened (but cannot be confirmed).

Repairing and reinstalling Microsoft EdgeWebView2 Runtime seems to sometimes improve the issue, but does not solve it.

Useful logs

No logs can be found

[github-actions]

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

• displayDialogAsync results in erroneous Display Dialog Error  #4105

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Possible solution (Extracted from existing issue, might be incorrect; please verify carefully)

As a workaround, could you try adding the specific URL you are attempting to open in your AppDomain and test?

Reference:

• displayDialogAsync results in erroneous Display Dialog Error  #4105 (comment)

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