Seems the c++ part is causing problems. On windows I would suspect a missing dotnet runtime but ios doesn’t seem to use it. Could a system update of some sort change the way ios compiles? Could it have changed something with Xcode or Code signing certificates?
Maybe something to do with the apple developer account?
I’m more a PC Guy.
Sometimes verifying your engine from the epic games launcher can also fix compiles when it comes to recognizing SDK’s