Subdomain name cannot be accessed through CDN

Question

I have a domain name attached to Cloudflare with SSL(Full strict).

foo.domain.com is okay. But example.foo.domain.com can’t be accessed normally.
I reconfirmed that the SSL certificate of the source station is normal and can be accessed normally when the CDN is not used. But as long as I use CDN, there will be an error message: ERR_SSL_VERSION_OR_CIPHER_MISMATCH

In other words, all third-level domain names using CDN cannot be accessed normally. Do you need additional conditions (e.g. payment) or settings for normal access?

You would need a dedicated certificate to do that.

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What does this mean?

The source station is configured with an SSL certificate of ‘example.foo.domain.com’.

Does this mean that this certificate needs to be uploaded to Cloudflare?

Does that mean I need to pay for this function? (Free users are not allowed to upload their own certificates)

It takes time for a dedicated certificate to be configured.

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You would need a dedicated certificate with custom hostnames to cover a 3rd level domain, it is not included in the standard free cert provided.

Correct, I believe the dedicated certificate with custom hostnames is $10/mo.

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