But when I click on “View Responsive Web Design Certification” it takes me to the homepage and displays a message saying “You can now claim the Legacy Responsive Web Design V8 certification! Visit your settings page to claim your certification."
You have a setting on your account you need to change to allow certifications to be made visible
You need to claim the Legacy Responsive Web Design certification
There is likely a flash message explaining why you are unable to view your Responsive Web Design certification, but it is overwritten by the flash message explaining you are able to claim the Legacy cert.