Proxying Traefik Admin Panel on custom path - authentication error

Traefik Traefik v3 (latest)
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1

Hi,
I am trying to proxy the Traefik admin panel URL to use a custom prefix (/traefik). My testing domain is lenovo.lab.
I modified my dynamic configuration .yml file accordingly to the official Traefik documentation, however, so far I haven't been able to get it to work.

While requesting http://lenovo.lab/traefik I am getting HTTP 404 error.
However, request for http://lenovo.lab/dashboard returns HTTP 401 UNAUTHORIZED error.

I generated my credentials as stated in documentation.

I am also proxying another service - Apache Guacamole which works just fine (though I haven't tested it with authentication yet).

My docker-compose file:

version: '3'

services:
  traefik:
    container_name: cvmm-traefik-proxy
    restart: always
    image: traefik
    command:
     #DELETE BEFORE RELEASING
     - "--providers.docker=true"
     - "--log.level=DEBUG"
     #- "--api.insecure=true"
     - "--api.dashboard=true"
     - "--providers.file.directory=/dynamic-configuration"
     - "--providers.file.watch=true"
     - "--entrypoints.web.address=:80"
     - "--entrypoints.websecure.address=:443"
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
      - "./dynamic-configuration:/dynamic-configuration"
    networks:
      cvmm-external:
      cvmm-internal:

networks:
  cvmm-external:
    name: cvmm-external
    external: false
  cvmm-internal:
    name: cvmm-internal
    external: true

My dynamic configuration file:

http:
  routers:
    cvmm-traefik-router:
      rule: Host(`lenovo.lab`) && (PathPrefix(`/traefik`) || PathPrefix(`/dashboard`) || PathPrefix(`/api`))
      service: api@internal
      entryPoints: web
      middlewares: auth
    cvmm-guacamole-guacamole-router:
      rule: "Host(`lenovo.lab`) && PathPrefix(`/guacamole`)"
      service: cvmm-guacamole-guacamole-service
      entryPoints: web

  middlewares:
      auth:
        basicAuth:
          users:
            - "test:$apr1$ssuQ3rCw$ls3xyHMqzgDXdhBXucGEp/"

  services:
    cvmm-guacamole-guacamole-service:
      loadBalancer:
        servers:
          - url: "http://cvmm-guacamole-guacamole:8080/guacamole"
2

Traefik dashboard only works with /dashboard/ and also requires /api/.