Hi! I'm trying to move from CoreMedio I/O DAL Plug-In to CoreMedia I/O camera extensions, announced in macOS 12.3. I created a test extension, placed it inside my app bundle into Contents/Library/SystemExtensions and signed with codesigning certificate. But when I try to install my extension from inside my app, using this code (Swift): func requestActivation() { guard case .idle = status else { fatalError("Invalid state") } print("Requesting activation of extension \"\(extensionIdentifier)\"") let req = OSSystemExtensionRequest.activationRequest(forExtensionWithIdentifier: extensionIdentifier, queue: DispatchQueue.main) req.delegate = self OSSystemExtensionManager.shared.submitRequest(req) status = .requested } I'm getting an error: OSSystemExtensionErrorDomain error 8: Code Signature Invalid which is rather generic. Can anybody tell me what I am doing wrong? Or at least propose some steps to find it out? I'm posting here entitlements and codesign output for my extension and containing application for further information. kdg@admins-Mac-mini SystemExtensions % codesign -d --entitlements - ./com.visicom.VirtualCamera.avextension.systemextension Executable=/Applications/VirtualCamera.app/Contents/Library/SystemExtensions/com.visicom.VirtualCamera.avextension.systemextension/Contents/MacOS/com.visicom.VirtualCamera.avextension [Dict] [Key] com.apple.security.app-sandbox [Value] [Bool] true [Key] com.apple.security.application-groups [Value] [Array] [String] 6SUWV7QQBJ.com.visicom.VirtualCamera kdg@admins-Mac-mini /Applications % codesign -d --entitlements - ./VirtualCamera.app Executable=/Applications/VirtualCamera.app/Contents/MacOS/VirtualCamera [Dict] [Key] com.apple.developer.system-extension.install [Value] [Bool] true [Key] com.apple.security.app-sandbox [Value] [Bool] true [Key] com.apple.security.application-groups [Value] [Array] [String] 6SUWV7QQBJ.com.visicom.VirtualCamera [Key] com.apple.security.files.user-selected.read-only [Value] [Bool] true kdg@admins-Mac-mini SystemExtensions % codesign -dvvv ./com.visicom.VirtualCamera.avextension.systemextension Executable=/Applications/VirtualCamera.app/Contents/Library/SystemExtensions/com.visicom.VirtualCamera.avextension.systemextension/Contents/MacOS/com.visicom.VirtualCamera.avextension Identifier=com.visicom.VirtualCamera.avextension Format=bundle with Mach-O universal (x86_64 arm64) CodeDirectory v=20500 size=1553 flags=0x10700(hard,kill,expires,runtime) hashes=37+7 location=embedded Hash type=sha256 size=32 CandidateCDHash sha256=25bd80657bfd6e0ab95467146c7b532817e9e520 CandidateCDHashFull sha256=25bd80657bfd6e0ab95467146c7b532817e9e5209fd50b0cb7ceef40dcfb40e8 Hash choices=sha256 CMSDigest=25bd80657bfd6e0ab95467146c7b532817e9e5209fd50b0cb7ceef40dcfb40e8 CMSDigestType=2 CDHash=25bd80657bfd6e0ab95467146c7b532817e9e520 Signature size=9006 Authority=Developer ID Application: Visicom Media Inc. (6SUWV7QQBJ) Authority=Developer ID Certification Authority Authority=Apple Root CA Timestamp=7 Jul 2022, 21:49:32 Info.plist entries=23 TeamIdentifier=6SUWV7QQBJ Runtime Version=12.3.0 Sealed Resources version=2 rules=13 files=0 Internal requirements count=1 size=200 kdg@admins-Mac-mini /Applications % codesign -dvvv ./VirtualCamera.app Executable=/Applications/VirtualCamera.app/Contents/MacOS/VirtualCamera Identifier=com.visicom.VirtualCamera Format=app bundle with Mach-O universal (x86_64 arm64) CodeDirectory v=20500 size=1989 flags=0x10700(hard,kill,expires,runtime) hashes=51+7 location=embedded Hash type=sha256 size=32 CandidateCDHash sha256=31e15fbbd436a67a20c5b58c597d8a4796a67720 CandidateCDHashFull sha256=31e15fbbd436a67a20c5b58c597d8a4796a6772020308fb69f4ee80b4e32788b Hash choices=sha256 CMSDigest=31e15fbbd436a67a20c5b58c597d8a4796a6772020308fb69f4ee80b4e32788b CMSDigestType=2 CDHash=31e15fbbd436a67a20c5b58c597d8a4796a67720 Signature size=9006 Authority=Developer ID Application: Visicom Media Inc. (6SUWV7QQBJ) Authority=Developer ID Certification Authority Authority=Apple Root CA Timestamp=7 Jul 2022, 21:58:09 Info.plist entries=20 TeamIdentifier=6SUWV7QQBJ Runtime Version=12.3.0 Sealed Resources version=2 rules=13 files=4 Internal requirements count=1 size=188 Thanks in advance!