Hey! Welcome 
It looks like the SSL error on your custom domain, while the Vercel default domain works fine, points to something going on with either SSL certificate provisioning or your DNS configuration for anka-aktas.com.
First, double-check your DNS setup to make sure the records are pointing to Vercel’s servers correctly, whether you’re using A, AAAA, or a CNAME record. Then, head over to your project’s Domains section in the Vercel Dashboard and take a look at the SSL certificate status. If it’s stuck on “Pending” or showing as “Failed,” try removing and re-adding the domain to refresh the certificate.
It’s also worth making sure your domain itself is fully configured in the project settings. Sometimes removing it and adding it again can trigger a fresh SSL certificate and resolve the issue.
Since this is happening specifically on your partner’s work laptop, another thing to keep in mind is their corporate network. Some networks enforce strict SSL/TLS policies or block certain cipher suites, which can cause this kind of error. If that’s the case, try loading the site explicitly with https:// and see if that helps.
For more details, you can check out the Custom Domains documentation or the SSL troubleshooting guide.