Has anyone tried to promote a second generation (unlocked) package to released yet? I just tried it for the first time today and I am getting the error message:

INSUFFICIENT_ACCESS_OR_READONLY: You don't have the correct user perm to promote a package version to released. Ask your Salesforce admin for help

Does anyone know what I need to change in my user setup to allow this? I'm already in the System Administrator profile and I am able to create scratch orgs, version packages etc.