My UI test is performed on iPhone 13 Pro 15.3.1, with Xcode 13.2.1. I have narrow down the issue as below two tests. The test code below just send a simple https request. I have allowed the network access for the test app on both Wifi and cell. And I'm a paid developer. All following two tests are passed in simulator but failed on iPhone, so it means something is wrong in iPhone side, but I couldn't figure out it. Need help, guys. The error exists with WiFi and Cellular. URLSession request is denied on both Wi-Fi interface and cellular interface. NSURLErrorNWPathKey=unsatisfied... 1st test: The test code is provided in Apple doc (https://developer.apple.com/documentation/xctest/asynchronous_tests_and_expectations/testing_asynchronous_operations_with_expectations). func testDownloadWebData() { // Create an expectation for a background download task. let expectation = XCTestExpectation(description: "Download apple.com home page") // Create a URL for a web page to be downloaded. let url = URL(string: "https://apple.com")! // Create a background task to download the web page. let dataTask = URLSession.shared.dataTask(with: url) { (data, _, _) in // Make sure we downloaded some data. XCTAssertNotNil(data, "No data was downloaded.") // Fulfill the expectation to indicate that the background task has finished successfully. expectation.fulfill() } // Start the download task. dataTask.resume() // Wait until the expectation is fulfilled, with a timeout of 10 seconds. wait(for: [expectation], timeout: 10.0) } 2nd attempt: I also try my version, but get the same result. func testDownloadWebData() { // Create an expectation for a background download task. let expectation = expectation(description: "Download apple.com home page") // Create a URL for a web page to be downloaded. let url = URL(string: "https://apple.com")! var request = URLRequest(url: url) request.httpMethod = "GET" let config = URLSessionConfiguration.default config.waitsForConnectivity = true let session = URLSession(configuration: config) // Create a background task to download the web page. let dataTask = session.dataTask(with: request) { (data, _, error) in // put a breakpoint here, no triggered. guard error == nil else { print(error!.localizedDescription) return } // Make sure we downloaded some data. XCTAssertNotNil(data, "No data was downloaded.") // Fulfill the expectation to indicate that the background task has finished successfully. expectation.fulfill() } // Start the download task. dataTask.resume() // Wait until the expectation is fulfilled, with a timeout of 10 seconds. wait(for: [expectation], timeout: 10.0) }