At my company, we created a new group to move data from an older group. When we try using the copy to/ move to feature to the new group, it won't show in the destination. We can move files from the new group to the older groups.
Go to the new groups SharePoint site. And click the Star in the top right on the page to follow the site. This will force the site to your list. If the star doesn't show, you have to wait for the providisioning to finish as sometime it takes a handful of minutes to appear.
