@eskimo, Yes, I updated to Big Sur and I got the same issue. I have raised FB9077129 for your kind reference.

Hello, the tutorial link is not available now. Is there a new link available?

The constraints seem to have been cached in the system. Remove the app per Readme of the sample code did not help. Re-build and re-install the package without constraints in the launch plist. Still the constraints violation is observed. How to clear the constraints cache on macOS 14.6.1?

Thank you Qunn! I noted the link you have provided and I will explore them. However, I was inspired by the simplicity of XPCListener-XPCSession and I wanted to try that with Constraints as an alternative to NSXPCConnection with listener(_:shouldAcceptNewConnection:) delegate. Is there, some document about how to use XPCPeerHandler? a way to get peer info from XPCListener.IncomingSessionRequest? so that accept/reject can be given for the handler based on the peer's info.