I have an application developed in QT in C++ and using Objective-C++ (.mm) as the native language for compiling IOs. In this application I need to access the configuration profiles installed on the iPhone (e.g. -> .pfx digital certificate) as I do successfully on MacOS using the keychain certificate. I am using the following code to try to search for the certificate in my .mm file: NSDictionary *query = @{ (id)kSecClass: (id)kSecClassCertificate, (id)kSecMatchLimit: (id)kSecMatchLimitAll, (id)kSecReturnRef: @YES, }; CFTypeRef result = NULL; OSStatus status = SecItemCopyMatching((CFDictionaryRef)query, &result); if (status == errSecSuccess) { NSArray *response = (__bridge_transfer NSArray *)result; for (id r in response) { qDebug() << "ok"; } } else { qDebug() << "error certificate: " << status; } Running this code always returns: error certificate: -25300 (errSecItemNotFound). Even with configuration profiles installed on the iPhone, they are listed in the tab VPN Management and Device -> Configuration Profiles. I would like to clarify some points such as: Is it possible to access the certificates installed on the IOs, list them and use them in digital signatures as I have already done successfully on MacOS (using the <Security/Security.h> lib in C++)? If it is possible, what would the code be like to list the installed configuration profiles and use their private key to sign the hash of a document? Is there any further configuration needed in the project architecture? For example: In XCode, I went to target -> Capability -> I added the Keychain sharing capability.