Thanks a lot for your explanation and all answers. I got it - so only one way to avoid Blocked System Extension popup it distribute application only via MDM - company admin should install app using MDM system and whitelist required system extension. Now it's clear. 🤝

About the links - I got it 🙏. Thank you Regarding technical question - my question is incorrect, or this vulnerability doesn't related to Apps or it's a secret by Apple)? Right now it doesn't totally clear, if you can elaborate more I'll really appreciate it

Thank you so much for full answer. Yes, we are distributing our application using Developer ID certificate with notarization. PKG passed notarization process successfully. We have solved the problem - 3rd party vendor confirmed that it was a false positive decision from their side. Right now the problem has beed solved. Thanks for your help 🙏

Hello everyone. We have got the same issue on BigSur. I would like to join this thread and receive any reply from Apple Support :)