This worked for the MacOS for me:
I honestly can't remember where I found this code but the navigation part I got from the other answer here, but you need to open up a Terminal and navigate to your app folder:
cd <PATH_TO_YOUR_APP>/<APP_NAME>.app/Contents/MacOS/
and add the following:
chmod -R 777 [applicationName].app
This unlocked the permissions on the application but when the app was opened, we had to allow permission through the Mac firewall to let it run on the computer. Once we approved permission, the app ran no problem.
I hope this helps and I'm by no means a professional with this so but my friend and I can try to help in anyway possible.
(taken from the stackoverflow readme in the files, https://stackoverflow.com/questions/50577473/unity-game-compiled-in-windows-does...)