Blank Pages When Trying to Login WP-Admin

I have been having a ton of brute-force attacks on a website.
So I am not trying to run it through Cloudflare. When I turn off Cloudflare’s proxy in DNS everything works fine. However, when I turn on the proxy when I try to log in I get a blank page.

I have SSL/TLS Mode set to Full (Strict)
Always HTTPS set to “Disabled”
HSTS is disabled
Automatic HTTPS Rewrites “Disabled”

My main objective is to try and protect the wp-admin page, but I have to figure out the blank page problem first.
Can anyone offer some assistance?

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