How to make custom page for 1020 error?

Hi, I want to make a custom page for 1020 error
(Country block error code for firewall setting)

I made html file with ::CLIENT_IP:: and ::RAY_ID:: token.

In Cloudflare preview, it was working well.
However, when I try to test it on my PC or Phone, it does not work.
It still shows the default 1020 error page, not my custom one.

How can I fix it?

Thanks.

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