I have 2 sites, one on my main domain and one on my subdomain, with my main domain I can Regenerate critical CSS using WP Rocket without problem, but when I try to do it with my Subdomain it fails, the error says to Allow the IP address in Cloudflare and I have already done that.
My account with cloudflare is free.
Have you had this issue before? You know how to fix it? Thanks in advance.