How to create SSL certificates with Traefik Ingress Controller?

I have a BareMetal Kubernetes cluster with a Traefik Ingress controller.
In front of the cluster is a HAProxy that forwards the requests to the Ingress Controller. Normal HTTP requests (Ingress Rules) work fine.
How can I generate SSL certificates with Traefik. I have already tried with the cert manager, but the certificate is never completed.

The well-known directory can be accessed from outside.
Can someone help here?