If you can’t open an app
You may not have the privileges to open the app, the app may be damaged, or it may not be installed.
If you aren’t an administrator of your Mac, the administrator may be preventing you from using the app. Contact the administrator of your Mac.
You may be trying to open an app that is not registered with Apple by an identified developer. If you want, you can open an app from an unidentified developer.
The app may be damaged. Try reinstalling it. If you still can’t open the app, contact the app’s manufacturer.
If you recently installed a new version of macOS, some apps may need to be updated or reinstalled to work correctly.