After CDN is turned on, https cannot be accessed

Select Full for SSL, enable CDN for parsing, and enable https after deploying the Let’s Encrypt certificate on the website. The website cannot be accessed, prompt: This website cannot provide a connection, uses an unsupported security protocol. ERR_SSL_VERSION_OR_CIPHER_MISMATCH protocol not supported
The client and server do not support generic SSL protocol versions or cipher suites. If the CDN is turned off, https access can be used normally.

Please add the big guys how to solve this?

Are you using a nested subdomain? For example,

More than one level deep subdomains are not supported on Universal SSL (the default). You’ll need to use Advanced Certificates if you want a deeper subdomain.

Secondly, if the Let’s Encrypt certificate is on your server you’ll want to use Full (Strict) mode per: Why you should choose Full Strict, and only Full Strict

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