I'm facing an issue in publishing an app to the App Source. I have created a Marketplace Offer on Office Store, Offer Name is SharePoint Solution. Now in the third step of publishing an app, Packages I'm not seeing that it allows me to upload ab sppkg file. Still, I tried at that time I got the following error:
Package acceptance validation error: XML Schema Validation Error Error found during XML Schema validation. Error code: The element 'Properties' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest' has invalid child element 'AppIconPath' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest'. List of possible elements expected: 'SupportPage, SupportedLanguages, UninstallingEventEndpoint, StartPage, InstalledEventEndpoint, UpgradedEventEndpoint, SettingsPage, WebTemplate' in namespace.
Package acceptance validation error: XML Schema Violation Your manifest does not adhere to the current set of XML schema definitions for Office Add-in manifests.
Can you tell me where I'm missing something? Do we need to generate a package differently? Please help me.
I have seen that this issue was already resolved in 2020.I have seen that here