I can only view all the solutions to my projects if both portfolio and timeline are set to public in the settings.
If portfolio is public but timeline is private, I can only see my solutions when I am logged in. If I sign out and go to my personal page, then my solutions are not longer there. It seems like they are only visible to myself but not to the public.
You need to go to your account settings to claim your certificate. Before you can do so, you also need to agree to the Academy Honesty Pledge.
To make your certificate appear in your profile, you need to have your profile, your timeline and your certificates set to public. If you want your name to appear on your certificate you also need to have your name set to public.