This website is using a security service to protect itself from online attacks. The action you just performed triggered the security solution. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data.
What is the issue you’re encountering
When adding website at cloudflare, my website was blocked.
The error code you’re experiencing indicates that a WAF or a Security rule was triggered at Cloudflare.
I’d suggest you to navigate to the Cloudflare dashboard → Security → Events and lookup for Firewall events for the past 24hours or so. Once you find them, click on a particular one to find more details about it (user-agent, IP, HTTP version …).
You should see the challenged/blocked firewall events in the Events tab.
Could you share some details which service was triggered that is showing the expected default Cloudflare block page even for us when we visit your Website?
Therefrom we could troubleshoot further and provide feedback information to help you solve your issue.