Useless certificate request

Hi,
Not sure if this is the correct forum for this but please let me at least try.
Can someone please point me into the right direction how to get rid of this useless certificate request?

ERR github.com/traefik/traefik/v3/pkg/provider/acme/provider.go:482 > Unable to obtain ACME certificate for domains error="unable to generate a certificate for the domains [nextcloud-app-nextcloud]: acme: error: 400 :: POST :: https://acme-v02.api.letsencrypt.org/acme/new-order :: urn:ietf:params:acme:error:rejectedIdentifier :: Invalid identifiers requested :: Cannot issue for \"nextcloud-app-nextcloud\": Domain name needs at least one dot" ACME CA=https://acme-v02.api.letsencrypt.org/directory acmeCA=https://acme-v02.api.letsencrypt.org/directory domains=["nextcloud-app-nextcloud"] providerName=myresolver.acme routerName=web-nextcloud-app@docker rule=Host(`nextcloud-app-nextcloud`)

this is a part of my dynamic.yml

...
    websecure-nextcloud-app:
      rule: Host(`nc.mydomain.cc`)
      entryPoints:
        - "websecure"
      service: nextcloud@file
      tls:
        certResolver: "myresolver"
      middlewares:
        - nextcloud-app-https-redirect
...

I only have Host() rules with subdomain.domain.tld in the configuration.
Thank you for any kind of help on this!
kr,
Martin

Never thought it might be that simple. Remove

traefik.enable=true

from the labels: in docker-compose.yml

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