The most common problem when assigning own domain is that subdomain for the chat is not created. Please check if chat.yourdomain.com is pointing to the same IP like main yourdomain.com domain.

One more thing, to trigger site setup/resetup you need to change domain name, so in some cases you need to switch back to .una.io domain and then back to your real domain, also you can switch between yourdomain.com and www.yourdomain.com to trigger site resetup as well.