Calendar : cURL error 60: Peer's Certificate issuer is not recognized

When trying to access an iCal over https I get this error “cURL error 60: Peer’s Certificate issuer is not recognized.”

I cannot change the certificate, is there a way of freePBX recognising it?

https://www.google.com/search?q=CURL+error+60:+Peer’s+Certificate+issuer+is+not+recognized&spell=1&sa=X&ved=2ahUKEwjAwoD8s_TxAhWS_54KHXNRDlwQBSgAegQIARAw&biw=1928&bih=924

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