I'm coming back, because I have to use DNS Challenge, I think so...
Because I want to secure some other ports like 32400 (plex) and I would like to do it with traefik.
I have opened another topics recently :
And from another people about it :
I think so, I have to use DNS challenge to do what I want to do.
Are you sure it's not a "bug" about traefik (bad request for example), because 22 days ago, I have tried with certbot, and I was able to add the entry to the DNS ?