I am interested in uploading a package privately to package share (and to later make public as a connector). Following the documentation to uploading a package, I first need to share the package privately.
This is the error I get when attempting to privately share my package from the AEM package manager of my local instance: 
My package is a part of its own group on the left side of the package manager. I am signed into my Adobe account. I am pressing Share for my package on my local AEM instance inside package manager. The User in the share dialog is my adobe email, and my Company is N/A.