I also has this issue mac os catalina,Xcode Version 12.3 (12C33) , iPhon11 14.2 my test code is easy  XCUIApplication *app = [[XCUIApplication alloc] init];  [app launch]; if I run test case with Xocode, I get error failed to get automation session for com.xxxxxx.xxxx:0: Timed out while requesting automation session for com.xxxxxx.xxxx (pid:44238). if I run with xcodebuild xcodebuild	build-for-testing -project ${script_dir}/***.xcodeproj \scheme *** -destination	"platform=iOS,name=***" test -only-testing:***/***/testExample I get Failed to get automation session for com.xxxx:44179: Unable to communicate with helper. . Please retry the operation. If it fails, please exit and restart the application, and then try again。. connection on mach service named com.apple.dt.xctestd.target from pid 44179 but in iPhone7, 14.2 is OK，so any bug in iPhon11？