TTraefik dont work when the domainname is not using the compose service name

I am migrating Traefik V1 to V2 with some strange issues. when i use the app name with the subdomainname, Traefik works perfectly fine. However, some containers wont works when using a different name.
For example ( app name nextcloud > cloud.example.com)
There is only one container which is working with a different name. But looks the name as the other ones.
Here is my compose file:

networks:
  reverseproxy:
      name: reverseproxy        
  dockersock-proxy:
      name: dockersock-proxy
      external: true
  intern:      
      name: intern
  nextcloud:
      name: nextcloud

services:
  traefik2:
    container_name: traefik2
    image: traefik:cantal
    restart: always
    command:
      - --global.checkNewVersion=true
      - --global.sendAnonymousUsage=false
      - --entryPoints.http.address=:80
      # https://www.reddit.com/r/docker/comments/c1wrep/traefik_reverse_proxy_question_docker_overlay/
#      - --entrypoints.http.forwardedHeaders.trustedIPs=127.0.0.1/31, 192.168.90.1/24
#      - --entrypoints.http.proxyProtocol=true
#      - --entrypoints.http.proxyProtocol.trustedIPs=127.0.0.1/31, 192.168.90.1/24
      - --entryPoints.https.address=:443
      - --entryPoints.traefik.address=:8080
#      - --api=true
      - --api.insecure=true
#      - --serversTransport.insecureSkipVerify=false
      - --log=true
      - --log.level=INFO # (Default: error) DEBUG, INFO, WARN, ERROR, FATAL, PANIC
      - --accessLog=true
      - --accessLog.filePath=/var/log/docker/traefik.log
      - --accessLog.bufferingSize=100 # Configuring a buffer of 100 lines
      - --accessLog.filters.statusCodes=400-499
      - --providers.docker=true
#      - --providers.docker.defaultrule=Host(`{{ index .Labels "com.docker.compose.service" }}.$DOMAINBASE`)
      - --providers.docker.exposedByDefault=false
      - --providers.docker.network=reverseproxy
#       - --providers.docker.endpoint=tcp://dockersock-proxy:2375
      - --providers.docker.swarmMode=false
      - --providers.file.directory=/rules
      - --providers.file.watch=true
      - --certificatesresolvers.ovh.acme.dnschallenge=true
#      - --certificatesResolvers.ovh.acme.caServer=https://acme-staging-v02.api.letsencrypt.org/directory # uncomment when testing
      - --certificatesResolvers.ovh.acme.email=${SMTP_DEST_EMAIL}
      - --certificatesResolvers.ovh.acme.storage=/acme.json
      - --certificatesResolvers.ovh.acme.dnsChallenge.provider=ovh
    networks:
      - reverseproxy
      - dockersock-proxy
    ports:
      - "80:80"
      - "443:443"
      - "8080:8080"
    volumes:
      - $USERDIR/traefik2/rules:/rules
      - $USERDIR/traefik2/acme.json:/acme.json
      - $USERDIR/traefik2/traefik.log:/var/log/docker/traefik.log
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      OVH_ENDPOINT: ovh-eu
      OVH_APPLICATION_KEY: ${OVH_APPLICATION_KEY}
      OVH_APPLICATION_SECRET: ${OVH_APPLICATION_SECRET}
      OVH_CONSUMER_KEY: ${OVH_CONSUMER_KEY}
    labels:
      - "traefik.enable=true"
      # HTTP-to-HTTPS Redirect
      - "traefik.http.routers.http-catchall.entrypoints=https"
      - "traefik.http.routers.http-catchall.rule=HostRegexp(`{host:.+}`)"
      - "traefik.http.routers.http-catchall.middlewares=redirect-to-https"
      - "traefik.http.middlewares.redirect-to-https.redirectscheme.scheme=https"
      # HTTP Routers
      - "traefik.http.routers.traefik-rtr.entrypoints=https"
      - "traefik.http.routers.traefik-rtr.rule=Host(`traefik.$DOMAINBASE`)"
      - "traefik.http.routers.traefik-rtr.tls=true"
      - "traefik.http.routers.traefik-rtr.tls.certresolver=ovh"
      - "traefik.http.routers.traefik-rtr.tls.domains[0].main=$DOMAINBASE"
      - "traefik.http.routers.traefik-rtr.tls.domains[0].sans=*.$DOMAINBASE"
      ## Middlewares
      ## Services - API
      - "traefik.http.routers.traefik-rtr.service=api@internal"

  portainer:
    container_name: portainer
    hostname: portainer
    restart: unless-stopped
    image: portainer/portainer
    user: ${PUID}
    command: -H tcp://dockersock-proxy:2375 --no-auth
    volumes:
      - ${USERDIR}/portainer:/data
    ports:
      - "9000:9000"
    environment:
      TZ: ${TZ}
    depends_on:
      - dockersock-proxy    
    networks:
      - reverseproxy
      - dockersock-proxy      
    labels:
      - "traefik.enable=true"
      ## HTTP Routers
      - "traefik.http.routers.portainer-rtr.entrypoints=https"
      - "traefik.http.routers.portainer-rtr.rule=Host(`piet.$DOMAINBASE`)"
      - "traefik.http.routers.portainer-rtr.tls=true"
      - "traefik.http.routers.portainer-rtr.tls.certresolver=ovh"
      ## Middlewares
      ## HTTP Services
      - "traefik.http.routers.portainer-rtr.service=portainer-svc"
      - "traefik.http.services.portainer-svc.loadbalancer.server.port=9000"      

  nextcloud:
    container_name: nextcloud
    restart: unless-stopped
    image: nextcloud:18.0
    hostname: nextcloud
    volumes:
      - ${USERDIR}/nextcloud:/var/www/html
      - /srv/dev-disk-by-label-Data/nextcloud:/var/www/html/data
    depends_on:
      - nextcloud-mariadb
      - nextcloud-redis
      - nextcloud-news
    ports:
      - "90:80"
    user: ${PUID}  
    environment:
      TZ: ${TZ}
      NEXTCLOUD_TRUSTED_DOMAINS: thuis.${DOMAINBASE}
      REDIS_HOST: nextcloud-redis
    sysctls:
      net.ipv4.ip_unprivileged_port_start: "0"
    networks:
      - reverseproxy
      - nextcloud
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.nextcloud-rtr.entrypoints=https"
      - "traefik.http.routers.nextcloud-rtr.rule=Host(`nextcloud.$DOMAINBASE`)"
      - "traefik.http.routers.nextcloud-rtr.tls=true"
      - "traefik.http.routers.nextcloud-rtr.tls.certresolver=ovh"
      ## Middlewares
      ## HTTP Services
      - "traefik.http.routers.nextcloud-rtr.service=nextcloud-svc"
      - "traefik.http.services.nextcloud-svc.loadbalancer.server.port=80"      

Portainer works with all the subdomainnames (for example piet), but nextcloud wont works a domain other thhen nextcloud.example.com. For this example there is no middleware.

I cant finnd the correct answer after 3 days..... Any idea?