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The Application "{application name}" Can't Be Opened on MacOS with .NET MAUI · Gerald's blog about .NET, .NET MAUI, Blazor, ASP.NET, Git, Azure and more!
macos - How to fix 'The application "..." can't be opened' on Mac? - Super User
Right-click on the file and select "Show Package Contents." Open the "Contents" folder, then the "MacOS" folder. Inside, you should find a .txt file. Next, open Terminal and type "chmod +x " (make sure to include the space). Then, drag the .txt file into Terminal. This will change the file type.
It could be any of these solutions but once again I am not sure.
I do not have a mac myself so, unfortunately I'm not sure I'll be able to help much.
I've read about issues where the game might not work because it was not deployed on mac, I'll have to look into that if I'm able to borrow someone elses. Sorry.
If any specific one of these does work, please do let me know, thank you!