Upon checking just now, I see 5 licenses in your license page. All of them are each assigned to a site. If you're testing demos, you can register your staging domain to one of your license's Staging. For more details about Staging part of your license, please see Assigning a site at https://theme.co/apex/forum/t/setup-product-validation/55
4 of the license you posted in the secure note are part of the 5 licenses I mentioned above.
The rest of the licenses are registered to another user. Can you give us more details if you've registered the licenses previously or you have transferred them to your clients? I'll post the user's email in the secure note so you can try contacting the user to resolve license ownership. If you're the owner of the email, please check your email for license verification emails.