Error: Let’s Encrypt finalize bad status 403 - mail domain

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I moved away from Page Rules for ACME challenge configs in Cloudflare. I use the Configuration and Cache Rules now. I don’t make any specific WAF changes, only the following:

Configuration Rules:

Name: ACME Challenge
Expression: (starts_with(http.request.uri.path, "/.well-known/acme-challenge/"))
Automatic HTTPS Rewrites: Off
Browser Integrity Check: Off
Opportunistic Encryption: Off
Security Level Essentially Off
SSL: Off

Cache Rules:

Name: ACME Challenge
Expression: (starts_with(http.request.uri.path, "/.well-known/acme-challenge/"))
Cache status: Bypass cache

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