Domain alias redirects for apex domain but not subdomain

Hi guys,
my netlify site has primary domain, with redirecting automatically to the primary.
I then added 2 domain aliases to the primary: redirects to no problem in browser.

The second, however, is just its own site and doesn’t redirect to as it should.**

Any idea what might be causing this?

If is the primary, will automatically redirect to it.

Alias domains do not automatically redirect (and neither does

To have redirect to you will need to add a domain-level redirect to either the netlify.toml or _redirects file as outlined here.

Something like

  from = "*"
  to = ""
  force = true
  status = 301

or*    301!