ERR SSL VERSION OR CIPHER MISMATCH error for second level subdomain (second.first.website.com)

When I turn on proxy status ON for second level subdomain (second.first.website), I’m getting an error:

This site can’t provide a secure connection
second.first.website.com uses an unsupported protocol.
ERR_SSL_VERSION_OR_CIPHER_MISMATCH

But it works perfectly when I switch proxy status to DNS only.
Other first level subdomains and domains work well when proxied, only second level isn’t.

I’m using free plan and have already setup letsencrypt SSL on server.
Tried switching to different ssl options etc. But I think it may be related to the free plan. It would be very helpful if anyone provides any workaround. Thanks

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