Same problem: Since updating to Big Sur, I can't open an app I used all the time. Nothing works: Nor the "sudo chmod" command in terminal, nor reinstalling, nor changing the app permission on the app info (the app in question already has read and write privileges for all users included admin—which is me, the only user on this mac).
Trying to open the app with "sudo open -a" gave me the following message:
The application /Applications/RiseupVPN1.app cannot be opened for an unexpected reason, error=Error Domain=NSOSStatusErrorDomain Code=-10826 "kLSNoLaunchPermissionErr: User doesn't have permission to launch the app (managed networks)" UserInfo={LSFunction=LSLaunchWithRunningboard, _LSLine=2508, NSUnderlyingError=0x7fbf5d422ee0 {Error Domain=RBSRequestErrorDomain Code=5 "Launch failed." UserInfo={NSLocalizedFailureReason=Launch failed., NSUnderlyingError=0x7fbf5d41e590 {Error Domain=NSPOSIXErrorDomain Code=153 "Unknown error: 153" UserInfo={NSLocalizedDescription=Launchd job spawn failed with error: 153}}}}} Apple, please, get it together and fix it!