TLS For Accessory Developers: does it work for non-local network?

I'm following the approach in https://developer.apple.com/forums/thread/703234 section "Doing Even Better: Proper Security".

My question is: does it work if the accessory is not in the local network (i.e. out there on the Internet with an IP address) ?

I tried and: SecTrustEvaluateWithError(trust, nil) returns true, but TLS still fails:

ATS failed system trust
Connection 1: system TLS Trust evaluation failed(-9802)

<snip>

Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?,

Here is my code :

        var err = SecTrustSetPolicies(trust, SecPolicyCreateBasicX509())
        os_log("SecTrustSetPolicies returns \(err)")
        err = SecTrustSetAnchorCertificates(trust, [self.myCA] as NSArray)
        os_log("SecTrustSetAnchorCertificates returns \(err)")
        err = SecTrustSetAnchorCertificatesOnly(trust, true)
        os_log("SecTrustSetAnchorCertificatesOnly returns \(err)")

        // check the trust object
        let evalResult = SecTrustEvaluateWithError(trust, nil)
        os_log("SecTrust eval result: \(evalResult)")
        
        // create a credential with accepted server trust.
        let credential = URLCredential(trust: trust)
        completionHandler(.useCredential, credential)

the logs are:

SecTrustSetPolicies returns 0
SecTrustSetAnchorCertificates returns 0
SecTrustSetAnchorCertificatesOnly returns 0
SecTrust eval result: true

Did I do anything wrong? or is it not supported outside the local network?

Thanks.