Company CA for a backend service

Traefik Traefik v2
1

Hello,
I'm trying to use Træfik as a load balancer between a couple of servers. These servers has self signed certificates. I have the root CA from the company, and I've added it to the docker container:

My traefik.yml file: (static config)

log:
  level: DEBUG
api:
  dashboard: true
  insecure: true
entryPoints:
  proxy:
    address: ':8083'
providers:
  file:
    directory: /etc/traefik/dynamic-config
serversTransport:
  rootCAs:
    - /etc/traefik/rootca.crt

And a simple load-balancer: (Dynamic config)

http:
  routers:
    test1:
      rule: Host(`my-proxy.domain.com`)
      service: test1
  services:
    test1:
      loadBalancer:
        servers:
          - url: https://my-domain1.com
          - url: https://mydomain2.com

How ever, I still see x509: certificate signed by unknown authority in my logs:
(Shortened)

level=debug msg="vulcand/oxy/roundrobin/rr: begin ServeHttp on request" Request="{.... \"RequestURI\":\"/some/url\",\"TLS\":null}"
level=debug msg="vulcand/oxy/roundrobin/rr: Forwarding this request to URL" Request=...
level=debug msg="'500 Internal Server Error' caused by: x509: certificate signed by unknown authority"
level=debug msg="vulcand/oxy/roundrobin/rr: completed ServeHttp on request" Request=...
2

I've also tried adding this to the dynamic configuration:

tls:
  certificates:
    - certFile: /etc/traefik/rootca.crt
3

Seems like the correct place to add it is under the router:

http:
  routers:
    test1:
      rule: Host(`my-proxy.domain.com`)
      service: test1
      tls:
        certificates:
          - certFile: /etc/traefik/rootca.crt
  services:
    test1:
      loadBalancer:
        servers:
          - url: https://my-domain1.com
          - url: https://mydomain2.com