Unknown TLS options when trying to start container. Really confused why

Traefik Traefik v3 (latest)
1

I'm using Traefik version 3 in combination with docker.

My docker file has the following (snippet):

      - "traefik.http.routers.dashboard.tls=true"
      - "traefik.http.routers.dashboard.tls.options=modern@file"
      - "traefik.http.routers.dashboard.tls.certresolver=le"

My dynamic configuration file has the following:

tls:
  options:
    default:
      minVersion: VersionTLS12
      sniStrict: true
      cipherSuites:
        - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
        - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
        - TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
        - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
        - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
        - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
    intermediate: &intermediate_tls
      minVersion: VersionTLS12
      sniStrict: true
      cipherSuites:
        - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
        - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
        - TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
        - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
        - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
        - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
    modern: &modern_tls
      minVersion: VersionTLS13
      cipherSuites:
        - TLS_AES_256_GCM_SHA384
        - TLS_CHACHA20_POLY1305_SHA256
      curvePreferences:
        - CurveP521
        - CurveP384
      sniStrict: true

I'm getting the following error however when starting traefik when trying to adjust TLS options:

2024-06-17T10:18:53-05:00 ERR github.com/traefik/traefik/v3/pkg/server/router/tcp/manager.go:191 > error="unknown TLS options: modern@file" entryPointName=websecure routerName=portainer@docker

Is there a way to fix this error? Why is modern@file unknown?

2

Do you load the dynamic config file via providers.file in static config?

What is &modern_tls?