acme on Cloudflare domains

[nikkon]

Hi all,

does anyone has a step-by-step guide to create certificates on domains hosted on Cloudflare?

every time i try to create a certificate i got the :
/var/log/acme.sh.log
[Wed Nov 13 10:46:25 EET 2019]   _on_issue_err
[Wed Nov 13 10:46:25 EET 2019]   Error add txt for domain:_acme-challenge.skynet.balaci.xyz
[Wed Nov 13 10:46:25 EET 2019]   Invalid domain.

the domain cam be resolved pretty easy. However, I miss something on the acme certificate definition or validation.

any input is appreciated.
thank you