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I've created a Microsoft Word Add-in that works as expected on one Windows server with Microsoft Office 2021 Professional installed. However, on another server where Microsoft Office 2021 Standard is installed, the Add-in is not functioning properly.

I was able to install my project's .vsto file on the server, and when I open Word through our desktop application, I can see the Add-in name when Word launches. Additionally, when I navigate to Mailings > Customize Ribbon > Add-ins, I can see my custom Add-in listed.

However, when I select Main Tabs under Customize Ribbon, expand the Mailings section, and find my Add-in labeled as <<No Label>>, adding it to the right-side panel using the Add >> button and clicking OK does not apply any changes to the Mailings tab.

On the other hand, the Add-in works flawlessly on the server with Office 2021 Professional installed.

I have tried the following troubleshooting steps without success:

  • Reinstalling the Add-in and VSTO.
  • Deleting the 2.0 folder.
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  • Please provide enough code so others can better understand or reproduce the problem. Commented Feb 6 at 19:01
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