I've seem to come across this issue as well in macOS 27 Beta 4. The app that we're developing needs to access other instances of the app on other computers on the local network and the prompt wasn't showing up, and there was no way to reach the others machines. But I've found a solution to this on Reddit: https://www.reddit.com/r/macosprogramming/comments/1v3s2o5/trouble_with_macos_27_beta_and_the_local_network/ https://www.reddit.com/r/MacOSBeta/comments/1urg42l/how_i_fixed_my_macos_27b3_networking_issues/ Basically disabling SIP and removing these two files: /Library/Preferences/com.apple.networkextension.plist /Library/Preferences/com.apple.networkextension.uuidcache.plist Then rebooting and the app should either ask permission or, how it worked for me, just start working and able to reach out to Local Network devices. I have made a Feedback Assistant submission to this: FB23981410