Recently getting error on Microsoft Partner that Excel Add-in is not compatible but still works on Excel Web

[nkjha-epi]

Summary:

The Excel Addin Risk Adjustment Toolkit does not seem to be working properly on Windows as well as MacOS Excel Desktop application since around 2 Months but it works on the Web. Configured some CORS policies, the CORS errors did not appear on the web since then but unsure about the error in the desktop version of the Excel app.

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: PC Desktop, Mac
• Host [Excel, Word, PowerPoint, etc.]: Excel
• Office version number: Windows: Version 2409 Build 16.0.18025.20160 | MacOS: Version 16.90 (24101387)
• Operating System: Windows 10, 11 and MacOS Sonoma 14.6

Expected behavior

The Addin should work properly on Windows as well as MacOS applications. I can't even see any relevant errors in my Cloudfront distribution from where the Add-in is hosted.

Current behavior

1. Currently, when trying to publish the Addin, I see these errors frequently:
   
   
   Not sure as to what can be done, as I see there is already WebView2 installed on the Windows system on which I'm trying to use this app.

Steps to reproduce

1. Go to the Link to Risk Adjustment Toolkit
2. Try to install it.
3. It will show this error:
   On Windows Excel App:
   
   On MacOS the Taskpane doesn't even load and at the bottom I see:

Provide additional details

1. I have tried resolving the CORS issues, but this error on the Partner account has started recently, less than a month ago.
2. I tried purging the cache from Cloudfront so as to avoid getting 304 error codes.
3. The S3 policies were reviewed n number of times, have added * in AllowedHeaders as well as AllowedMethods.
4. Added a new policy for the CORS to let the origins:
   https://.microsoft.com
   https://.office.com
   https://*.office365.com
   https://localhost
   https://excel.officeapps.live.com
   https://excel.office.com
   https://usc-excel.officeapps.live.com

Context

The Excel Add-in has been down in production since 2 months and it's affecting the reliability of this add-in for the majority of the users.

Useful logs

E2TA6KCZKB1HSN.2024-10-25-11.bb2ba305.gz
E2TA6KCZKB1HSN.2024-10-25-11.769c2390.gz
E2TA6KCZKB1HSN.2024-10-25-11.a002c845.gz
E2TA6KCZKB1HSN.2024-10-25-10.86d5cb4d.gz
E2TA6KCZKB1HSN.2024-10-25-10.8e644dcf.gz

[microsoft-github-policy-service]

Thank you for letting us know about this issue. We will take a look shortly. Thanks.