I have never had this issue.
This might be because of your Mac's security. Here's a video to troubleshoot it:
I also rebuilt the Mac files and added them. So you can try redownloading the files from here to see if that helps.
Here is another link for more information about troubleshooting your Mac's security: https://discussions.unity.com/t/the-application-cant-be-opened-mac-build-problem...