I added LEGO_DISABLE_CNAME_SUPPORT=false to my docker-compose.yml while my cloudflare dns settings were configured in the above mentioned way with the CNAME record. Same error still results.
I tried changing it to - LEGO_DISABLE_CNAME_SUPPORT=true in the environments section my docker-compose.yml.
And I changed my cloudflare DNS to use all A records.
I stopped my traefik container. and then re-ran it with a:
~/dockerfiles/traefik$ docker-compose up -d --build --force-recreate
Unfortunately, even here, the same error is still occurring.
Thanks for the help so far. What else should I look at to troubleshoot?