Thanks for your quick response, Eskimo! Is that right? If so, how do the failing systems differ from the working systems? You’ve already said that the failing systems include both Intel and Apple silicon machines. Are these other differences? Yes, you are correct. There is no other difference we found. we just know that its fresh partition where its failing. Are the working systems also running macOS 12.4? yes. its correct. Do all the systems have SIP enabled? Yes, SIP is enabled in all system. We are trying to find the problem but we don't know how to proceed. I hope when we are trying to install System Extension, OS internally checks notarisation status of extension using Apple Server and if it gets failed then it returns OSSystemExtensionErrorCodeSignatureInvalid so is there any server that we can check its ping-able/reachable or not in affected machine or there is any log that will help us to know the problem. Thanks & Regards, Mohmad Vasim

Thanks for your provided help eskimo!