The problem is that you didn't add subdomain for chat - chat.myhomestead.life, please add separate A record for chat subdomain pointing to the same IP as main site, or add CNAME the same way as you've had subdomain for www

After you've added chat subdomain change domain back as una.io subdomain (for example myhomestead.una.io & myhomestead-chat.una.io) then change back to myhomestead.life and chat.myhomestead.life