Uploaded MSIX has generic errors

datamystic  To upload to the store you have to send an msixbundle file, even if you only have one type of msix package. VStudio used to do this but stopped for some reason, probably because makeappx/makemsix seems to have been broken in newer releases.

Here are the manual instructions I have been using, which I found somewhere in the past:

1.   Locate folder with the msix file. 
2. Create a folder "Parent" and subfolder to that called "Packages".
3. Copy the MSIX file to the "Packages" folder.
4. You must use an old version of makeappx to create the bundle. There is an old one in the GitHub Repository for Microsoft/msix-packaging
5. In a powershell window RunAsAdmin, cd to the folder containing this makemsix.exe
6.  .\MakeAppx.exe bundle /v /d "{PathToFolder}\Parent\Packages" /bv {PackageVersionString} /p "{PathToFolder}\Parent\{PackageName}.msixbundle"
7. Cd to the Parent folder and compress to a zip file (don't just try to rename the original), then rename the extension to msixupload.

Good Luck!