Failing to get certificate with Traefik from Lets Encrypt - docker

Question

I am trying to get a certificate for my docker container but I keep getting errors, below is my docker-compose. This used to work before until i deleted the container to restart it again. I am using Traefik as the proxy and I am using it to request for certificates.
and I keep getting this error when i start my container to get the certitifcates.
Unable to obtain ACME certificate for domains "mydomain.com": unable to generate a certificate for the domains [mydomain.com]: error: one or more domains had a problem:\n[mydomain.com] acme: error: 403 :: urn:ietf:params:acme:error:unauthorized ::
Cannot negotiate ALPN protocol "acme-tls/1" for tls-alpn-01 challenge\n",
"providerName": "myresolver.acme"
Please note i have replaced the actual domain with mydomain.com and other lines of images in the docker compose have been left out for brevity. Is there any rule i am not following properly?
services:
##Reverse Proxy
traefik:
image: library/traefik:v2.6.0
container_name: traefik
labels:
- traefik.enable=false
command:
- --api.insecure=false
- --providers.docker
#
- --entrypoints.web.address=:80
- --entrypoints.web.http.redirections.entryPoint.to=websecure
- --entrypoints.web.http.redirections.entryPoint.scheme=https
- --entrypoints.websecure.address=:443
- --entryPoints.websecure.forwardedHeaders.insecure
- --entryPoints.web.forwardedHeaders.insecure
#
# ...
- --certificatesresolvers.myresolver.acme.email=email#email.com
- --certificatesresolvers.myresolver.acme.tlschallenge=true
- --certificatesresolvers.myresolver.acme.caserver=https://acme-staging-v02.api.letsencrypt.org/directory
# used during the challenge
- --certificatesresolvers.myresolver.acme.httpchallenge.entrypoint=web
- --certificatesresolvers.myresolver.acme.storage=/letsencrypt/acme.json
#logs
# Writing Logs to a File
- --log.level=DEBUG
- --log.filePath=/logs/traefik.log
- --log.format=json
## Access Logs
- --accesslog=true
networks:
- traefik
ports:
- "80:80"
- "443:443"
- "8080:8080"
restart: always
volumes:
- ./logs/traefik/:/logs/
- ./letsencrypt:/letsencrypt
- /var/run/docker.sock:/var/run/docker.sock:ro
portainer:
image: portainer/portainer:latest
container_name: portainer
restart: unless-stopped
security_opt:
- no-new-privileges:true
networks:
- traefik
ports:
- "9000:9000"
volumes:
- /etc/localtime:/etc/localtime:ro
- /var/run/docker.sock:/var/run/docker.sock:ro
- ./portainer-data:/data
labels:
- "traefik.http.routers.portainer.priority=1"
- "traefik.http.routers.portainer.rule=Host(`mydomain.com`)"
- "traefik.http.routers.portainer.tls=true"
- "traefik.http.routers.portainer.tls.certresolver=myresolver"
networks:
traefik:
name: traefik```