The process for organisations to put in-house apps onto Windows Store for internal use has been well-documented and is relatively straightforward. However, some third-party app developers who don't have the right account credentials may have trouble packaging apps to be published on Windows Store. To remedy this, Microsoft has released a detailed guide on how to overcome this problem.
When packaging apps using Visual Studio, the easiest way to do this is to use the "Create App Packages" wizard, which does it for you automatically. This works well for in-house development teams and publishers that have a Dev Center account. But developers who need to package their apps and don't have access to a publisher's Dev Center account details will have to do so manually.
According to Microsoft senior program manager Tim Harader:
The Create App Packages wizard clearly states that you need to sign into the Store account. Your only other option is to select “No” and you’re told you can only use the resulting package “…on a computer that has a developer license installed…” Fortunately, there’s a work-around! Developers can ensure the app is configured with the correct publisher and app information without having to sign into the publisher’s Store account. This does, however, require that the publisher delivers specific information to the developer that they will manually insert into the Visual Studio Manifest Designer before proceeding with the Create App Packages wizard.
Microsoft has a step-by-step guide for developers who have to package their apps manually for Windows Store here.
[Via Windows Blog]