I'm developing a VPN app. It's already in AppStore - https://apps.apple.com/ua/app/bubble-securitycloud/id1513609900?mt=12. After updating to Big Sur on my developing mac I started getting an error when hit download button: Unable to Download App. "Bubble SecurityCloud" could not be installed. Please try again later. On an other mac it downloads and works fine. I tried removing defaults; also tried removing network extension using pluginkit, which I usually need to do in order to switch between development and AppStore versions. Is there any system files that can be cleared to fix the problem?

I need to make distribute my mac VPN app through Developer ID. As I understand, to do so I need to convert my app NE to a system. Is there any guide to do so? I created a new system NE target, importer all files from old target, but looks like it's not enough. It doesn't work, in console when I'm trying to establish a connection I found these errors: neagent: 			 NEAgentSession: failed to create the delegate nesessionmanager: 	 Tearing down XPC connection due to setup error: Error Domain=NEAgentErrorDomain Code=2 "(null)" New plist contains NEMachServiceName, probably I need to use it to esatablish connection?