At the moment, the link sharing feature is only compatible with the traditional model view page, not with the Apps built with App Builder. However, Designer Plus accounts and above can easily share a link to their apps for non authenticated users:
- Enable the domain appbuilder.shapediver.com for embedding
- Share the link https://appbuilder.shapediver.com/v1/main/latest/?slug=YOUR_MODEL_SLUG with anyone, even if they don’t have a ShapeDiver account.
Let me know if that method works for you.