I use the DesktopAppConverter via PowerShell to create the "appx" file format.
This is what I do:
DesktopAppConverter.exe -Installer C:\Users\Mark\Desktop\input\ -AppExecutable MPA.exe -Destination C:\Users\Mark\Desktop\output -PackageName "1005Mark" -AppId "MobilePayAlerts" -Publisher "CN=Verylong-ID-HERE" -Version 1.0.0.0 -Makeappx -Verbose -Sign
So this is the error I'm getting when uploading the appx file: "Package acceptance validation error: The PublisherDisplayName element in the app manifest of 1005Mark.appx is Verylong-ID-HERE, which doesn't match your publisher display name: Mark."
But If I change the -Publisher parameter to Mark I get the following error(s):
Invalid package identity name: 1005Mark (expected: 1005Mark.MobilePayAlerts)
Invalid package family name: 1005Mark_x9f05h8vsrrp6 (expected: 1005Mark.MobilePayAlerts_921pvy5st3vqc)
Invalid package publisher name: CN=Mark (expected: CN=Verylong-ID-HERE)
This package’s manifest (Package/Properties/DisplayName) uses a display name that you have not reserved: 1005Mark
I think the PulisherDisplayName element is set by the optional parameter PackagePublisherDisplayName, which is different from Publisher.
Can you try this command?:
DesktopAppConverter.exe -Installer C:\Users\Mark\Desktop\input\ -AppExecutable MPA.exe -Destination C:\Users\Mark\Desktop\output -PackageName "1005Mark" -AppId "MobilePayAlerts" -Publisher "CN=Verylong-ID-HERE" -PackagePublisherDisplayName "Mark" -Version 1.0.0.0 -Makeappx -Verbose -Sign