You’re using the Self-Signed Certificate. Click on “I understand the risks and wish to continue” to use the Self-Signed Certificate, otherwise point again the domain to Cloudflare with their nameservers and use this command on a Terminal of a Mac/Linux system:
dig +short fek214kf.epizy.com
, where fek214kf.epizy.com should be replaced with the Main Domain that you can find on the Control Panel, to get the IP, or use a dig tool like digwebinterface.com or Google Dig to get it. After that replace 184.168.221.48 with the IP you’ve found with the dig method.