I setup a website at siteground,and bought a premium Cloudflare content delivery network (CDN) , when i tried to Set up Cloudflare, i got:
FAIL Failed to connect Cloudflare account. Cloudflare API returned Invalid host key."
I have contact siteground,he told me to contact cloudflare to resolve this problem.
I could not even open a ticket for that, because cloudflare tell me:
"We’re currently experiencing extremely high demand for Free support. Please visit the [Cloudflare Help Center](https://support.cloudflare.com/) and [Cloudflare Community](https://community.cloudflare.com/) portals to find quick answers to most common issues."