Can't run app because of permission in macOS v11 (Big Sur)

I installed macOS v11 (Big Sur) yesterday and since then I am not able to run some old application. This is the message I get:

You do not have permission to open the application

I think this application is from an unknown developer.

I tried different methods that were working in macOS v10.15 (Catalina) like:

spctl --master-disable

Or I tried also to disable SIP and AMFI.

I've also tried:

sudo xattr -rd com.apple.quarantine /Applications/my_app.app

If I run the application from the terminal, this is the text version of the error I get:

The application 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=0x7fcb24c13ec0 {Error Domain=RBSRequestErrorDomain Code=5 "Launched process exited during launch." UserInfo={NSLocalizedFailureReason=Launched process exited during launch.}}}

Also tried to disable encryption and run:

csrutil authenticated-root disable

This is the error window:

Solution 1:

I had this problem with the error "Termination Reason: Namespace CODESIGNING, Code 0x1" and I managed to open the application after I signed it again on that machine, with the command:

codesign --force --deep --sign - /Applications/AppName.app

No other solution worked for me.

Solution 2:

Open Terminal or iTerm and type sudo chmod -R 755, then drag the .app into the window, which will bring the full path into Terminal or iTerm. This worked for me, moving the -R option directly after chmod.

It will look like this:

sudo chmod -R 755 Path\ to\ app\ file.app

Press return.