Traefik 3 - Only Traefik Dashboard works

Traefik Traefik v3 (latest)
8

Found the issue:

error while adding rule Host(`homeassistant.REDACTED.com`, `haos.REDACTED.com`): error while adding rule Host: unexpected number of parameters; got 2, expected one of [1]

image
image2201×1633 243 KB

And it's not documented in:

However this fixes it:

core:
  defaultRuleSyntax: v2

Or: Host rule does not support multiple hostnames anymore