The second domain is redirecting to the principal

@superserge thanks for reaching out.

Have you had a chance to follow our Quick Start guide here?
https://docs.domainmappingsystem.com/getting-started/how-to-map-domains

We also have a troubleshooting guide, which is worth reading.

https://docs.domainmappingsystem.com/getting-started/troubleshooting

Please let me know if anything in there helps or where you may be getting stuck on the configuration steps. A couple tips:

• ensure you have an SSL properly configured for the alias domain
• clear cache at all levels (CDN, browser, site, server) when testing

Looking forward to hearing from you.