title: How to troubleshoot a VSTO addin that does not load in Microsoft word 365?
body: <p>My VSTO Word Add-in does not display when switched from word 2016 to Microsoft 365 word app. The Add-in was developed using visual studio and the target framework is 4.7.2. I uninstalled the existing Add-in and then re-installed the Add-in. Also Visual Studio 2010 Tools for Office Runtime and the target .net framework are installed.</p>
  
  <p>The Add-in is loaded and displays fine on my development machine with word 365. But it does not work on a different customer machine. How can I troubleshoot this issue?</p>
  
  <p>Thank you!</p>