Can not display my client's domains in my cloudflare partner account!

Maybe I’ll get help here, here’s my problem
1 - I followed this tutorial cpanel installation guide for CloudFlare certified partners - PDF Free Download
2 - Everything seems to work well on my side.
Except that my partner account that uses the same email address as my administrator account (since I do not have a DNS partner)
So I installed the WHMCS plugin in addition.
3 - My customers can easily connect by subscribing a free plan from the client area, except that no domain name appears in my Cloudflare partner account.
4 - All the websites that use the Cloudflare DNS do not display well, the CSS to change as soon as they put the DNS Cloudflare.
I’m looking for help