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You’ve certainly been thorough, but I don’t think Cloudflare can fix this.
Clickfunnels uses Cloudflare, so you have no control over settings, as evidenced by a lack of option for that CNAME.
If I were to guess, I’d say that the Clickfunnels end is not properly configured for your subdomain. They need to make sure their end is configured for HTTPS on your hemp subdomain. Have you asked them for help?