App Attach only working if the App is Installed Locally First

Let me help troubleshoot this like I would with a colleague! App Attach can be tricky, and I totally get the frustration when it's not working as expected.

From what you've described, you've got most of the basics covered - the packaging and conversion steps look good. But there are a few things that often trip people up with App Attach that we should check:

1. Quick question - when you say it only works if installed locally first, what exactly happens when you try to launch the app without local installation? Do you get any specific error messages?
2. One common gotcha: Have you checked if the certificate is properly deployed to ALL session hosts? Sometimes even if it shows up in the certificate stores, there might be permission issues or it might not be fully trusted.
3. For the MSIX package itself - did you include all the necessary dependencies when packaging? Sometimes apps need additional frameworks or runtimes that aren't immediately obvious.
4. Also, just to verify - I assume you've set up the share for the .CIM file and configured the proper permissions for the users who need to access it?

If you could provide some more details about what exactly happens when you try to launch the app without local installation, that would help narrow down where things might be going wrong.

Regards: 블랙툰.store