Looks like the Xcode 16.3 simulator is not the issue When the simulator uses 18.4 all network requests return a -1001 error No issues when the simulator uses 18.3

I have the same issue In the Xcode 16.3 simulator all network requests to our backend fail with error -1001 No issues with the Xcode 16.2 simulator or running on device

Similar issue report here: Very annoying warnings using XCode and SwiftUI

Same problem here, Still not fixed with Xcode 15.2 :(