Comment 1 for bug 1874527

Thanks for taking the time to report this bug. Multiple domain names are currently not supported; the case falls in the warning given in the page you pointed to:

---
Some Linux operating systems accept multiple domain names separated by spaces. However, other Linux operating systems and Windows treat the value as a single domain, which results in unexpected behavior.
---

I'm not sure of what the Linux distributions supporting multiple domain names are doing; I imagine the first one is expected to become the true hostname of the instance, while all of them have to be added at least to /etc/hosts. In any case I agree it is something we should support.