Staging site subdomain

How can I add my staging site?
My site registed in cloudflare is, but I create a staging site for tests but don’t work in internet and show me this advice

Il sito non può fornire una connessione protetta utilizza un protocollo non supportato.


Please change the Subdomain to: as is a second level subdomain which is not covered by standard SSL Certificates.

The standard SSL Cert covers:
but not:

thanks alot

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