Recommendations appear once your space is twinned and you've set preferences. If the shelf looks empty, run through this:
Is your twin ready? Recommendations are built around your actual rooms, so they show up after delivery.
Have you set preferences? Finish the short step, or update it under Account → Preferences.
Try refreshing — updating preferences regenerates your "For your space" picks.
You can always browse the full marketplace in the meantime. More on how this works: "How do product recommendations work?"