I just convinced someone to continue a repo as maintainer but I can’t publish to a foreign atmosphere users’ package.
Is there a way to be added as maintainer for an atmosphere package or do I really need to continue the package with my user account?
You can sort of do this. The original owner needs to create an organization (from theor developer account page) and add you to that organization. They will then need to publish the package under the organization name.
Clearly, it’s better to start out that way, rather than try and convert to an organization leter!