got the same problem on my Mac m1 Mini with macOS Monterey 12.4, xCode 13.4.1 before a couple of days i can build and test all my apps on Simulator or on my iPhone 12 itself. but for now i cant get it to run anymore.  If i click on "build" or use cmd+b to build, xCode says "build succeeded" but after that, nothing happens.  Simulator Tasks are started in the Background but nothing there to show up.  If i try to build on my iPhone device -> Build Succeeded but no app shows up.