Staging site subdomain

Security
#1

How can I add my staging site?
My site registed in cloudflare is www.lemeraviglieditalia.it, 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

www.staging.lemeraviglieditalia.it utilizza un protocollo non supportato.

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

#2

Please change the Subdomain to:

staging.lemeraviglieditalia.it as
www.staging.lemeraviglieditalia.it is a second level subdomain which is not covered by standard SSL Certificates.

The standard SSL Cert covers:
domain.tld
sub.domain.tld
but not:
sub2.sub.domain.tld

#3

thanks alot

#4

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