I added a new target for NEFilterControlExtension however if I run main target I still receive the same message: -[NEFilterManager saveToPreferencesWithCompletionHandler:]_block_invoke_3: failed to save the new configuration: (null) I left NEFilterManager without changes. For both NEFilterControlProvider and NEFilterDataProvider return .drop() in handleNewFlow to drop every flow in order to test the POC. Indeed, not sure why but when I run my dns proxy target, it works as expected and I have all the information in debug session but when I run one of the Content Filter Extension targets looks like it's not able to attach Not sure what causes the problem at this point. Would be grateful for any thoughts or suggestions!

UPDATE: I figured out how to set up the target schemes for extensions, but the problem with the init of the NEFilterManager remains. I tried to use com.apple.security.get-task-allow key in entitlements to test it on the device without supervised mode, however, that didn't work. I still receive -[NEFilterManager saveToPreferencesWithCompletionHandler:]_block_invoke_3: failed to save the new configuration: (null) in the console. I'd be grateful to hear if anybody has some thoughts or suggestions about that.