Client authentication (mTLS) return error 1020

Good morning, this is the first post for me in this community.
I have a problem: I need to protect a subdomain.
Assuming my domain is example.com I need to protect admin.example.com.
I set the client certificate on Cloudflare and installed it on my Windows device in the Personal folder with the exportable key, however when I connect to the site I get the access denied error directly without being asked which certificate to use.
As a firewall rule I set:
(http.host eq "admin.example.com" and not cf.tls_client_auth.cert_verified)
where example.com is my domain which for privacy reasons I will not write.

(post deleted by author)

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