Custom Pages - Under Attack

I’m trying to create a custom page for the “Under Attack” page, but when I preview it I get a Custom error preview failed - then if I refresh a few times the previews shows up.
Then when I publish I get another error: Custom page must be larger then 100 characters (Code:1203)
I included the correct token in the HTML ( ::IM_UNDER_ATTACK_BOX::slight_smile: and I also copied and paste the original CloudFlare default HTML page and still gives me the same error.

https://community.cloudflare.com/search?q=1203

I already followed the instructions from the link above but I get the same error.
There is no JS in the page. Just CSS style and HTML code

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