TrustKit is not working

[PawanEnp]

Hello,

Below is the code we have written

`
public override func urlSession(_ session: URLSession, task: URLSessionTask, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
// Call into TrustKit here to do pinning validation
if NetworkUtil.isTrustKitInitialized {
if TrustKit.sharedInstance().pinningValidator.handle(challenge, completionHandler: completionHandler) == false {
// TrustKit did not handle this challenge: perhaps it was not for server trust
// or the domain was not pinned. Fall back to the default behavior
completionHandler(.performDefaultHandling, nil)
} else {
// TrustKit did successfully handled this challenge and took decision based on trust chain
DDLogDebug("SSL Pinning handled successfully")
}
} else {
completionHandler(.performDefaultHandling, nil)
}
}

//FILE: NetworkUtil.swift
static func initializeTrustKit(urlStr: String) {

    //urlStr is passed here as an argument based on the user's selection of environment
    if let sslKeys = Constants.SSLKeys(),
       let url = URL(string: urlStr),
       let domain = url.host {
        let trustKitConfig = [
            kTSKSwizzleNetworkDelegates: false,
            kTSKPinnedDomains: [
                domain: [
                    kTSKEnforcePinning: true,
                    kTSKIncludeSubdomains: true,
                    kTSKPublicKeyHashes: sslKeys
                ]
            ]
        ] as [String: Any]
        TrustKit.initSharedInstance(withConfiguration: trustKitConfig)
        isTrustKitInitialized = true
    }
}

`

We are using BurpSuite to trace the network (setting up a proxy server and routing iPhone to use a proxy) and we can read all communication in plaintext.

This code was working but looks like on the latest iOS it is not working. I request help here.