A month ago when https://my.knowledge.store/ was not existing I was able to edit the Cortana channel on dev.botframework.com, add new users to 'deploy to group' option and share the link with those users. Once user log in to their MSA and accept the skill they would be able to use the skill.
Recently, due to site changes Microsoft came up with new site called https://my.knowledge.store/workspace where Cortana channel and its publishing will be managed. I completely followed following link to deploy to group https://help.knowledge.store/system_concepts/publishing/index.html#publish-to-group
but, I see few differences this time. It does not give 1. Link to share 2. Once deployed NEW users added are not tied to skill yet.
Is this a bug ?
'Publish to group' should be working. When you publish to group using the steps mentioned in the link, it will give you group access URL. This is the link you need to share for new users to test and use that skill.