SSL error for www subdomain

I cannot access the www version of my site coke.adaptgroup.com which is a subdomain of adaptgroup.com. The problem only occurs when I type the www in front. Please help.
ERR_SSL_VERSION_OR_CIPHER_MISMATCH
Unsupported protocol

The client and server don’t support a common SSL protocol version or cipher suite.

Regular SSL certificates only cover *.example.com, not *.*.example.com so a second-level subdomain like www.something.example.com won’t work due to how SSL certificates work. If you want to get this working, you’ll need a dedicated certificate with the hostname *.coke.adaptgroup.com on it.

https://support.cloudflare.com/hc/en-us/articles/228009108-Managing-Dedicated-SSL-Certificates

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