Can I create a managed package in a developer edition sandbox ?
|Knowledge Article Number||000205286|
|Description||Unable to create a managed package in a developer sandbox.|
|Resolution||Dev sandboxes are different from Developer Edition Orgs.
A Dev sandbox cannot be used to create managed packages for the AppExchange, but can be used to build and migrate code and other metadata/customizations to the production org which the sandbox is copied from, or other sandboxes belonging to that same production org, via Change Sets.
Developer Edition orgs are free, stand-alone orgs, made to develop apps and load them to the AppExchange.
You can sign up for a Developer Edition org here: