Hi jefito. Thanks for your response. Perhaps I wasn't clear in my original post, but the tags in question are already in use in the shared notebook. I understand the design that new tags can't be created, but I think that this is a bug since she can't add existing tags to our shared notes. Any thoughts?
I am getting the same error as Calebwwk (Only tags that are already in this notebook can be added to this note) on the mac client. I have a shared notebook with my wife in which I have existing notes with tags. However, when she tries to tag another note in the same notebook with the same tag it gives her this error. However, my wife can tag with existing tags in the web version of Evernote. I am a premium user, but my wife is not if that makes a difference. Any thoughts?