Same happens for me with both xcode and transporter (manually initiated submission to appstoreconnect) with 99% failure rate.

I mean, I'm submitting an .ipa to appstoreconnect via regular app GUI ("Distribute App..." in Xcode Organizer, "Deliver" in Transporter). Interesting enough, Application Loader worked fine.

Update: Ok, the original problem was missing entitlements. Now it fails with: default Finder +[NSExtensionContext _allowedItemPayloadClasses] not implemented. Setting the allowed payload classes to <private> default macmount-actions +[NSExtensionContext _allowedItemPayloadClasses] not implemented. Setting the allowed payload classes to <private> error cfprefsd Couldn't open parent path due to [2: No such file or directory] default macmount-actions NSApp cache appearance: -NSRequiresAquaSystemAppearance: 0 -appearance: (null) -effectiveAppearance: <NSCompositeAppearance: 0x14760ce80 ( "<NSAquaAppearance: 0x150811e30>", "<NSSystemAppearance: 0x15080cc90>" )> default distnoted register name: com.apple.nsquiet_safe_quit_give_reason object: com.mycompany.macmount-actions token: 3b0000003b pid: 52332 default macmount-actions *** Assertion failure in -[FPUIActionExtensionContainerViewController _configureWithDomainIdentifier:], FPUIActionExtensionContainerViewController.m:129 error Finder Action with identifier (<private>) did finish with error (Error Domain=com.apple.ViewBridge Code=14 UserInfo={com.apple.ViewBridge.error.hint=<private>, com.apple.ViewBridge.error.description=NSViewBridgeErrorServiceBootstrap}). error Finder FP Custom action sheet finished with error Error Domain=com.apple.ViewBridge Code=14 "(null)" UserInfo={com.apple.ViewBridge.error.hint=-[NSViewServiceMarshal bootstrap:withReply:] caught NSInternalInconsistencyException 'attempting to send message to non-existent action extension view controller' with backtrace ( "0 CoreFoundation __exceptionPreprocess + 176", "1 libobjc.A.dylib objc_exception_throw + 60", "2 Foundation -[NSCalendarDate initWithCoder:] + 0", "3 FileProviderUI -[FPUIActionExtensionContainerViewController _configureWithDomainIdentifier:] + 164", "4 FileProviderUI -[FPUIActionExtensionContainerViewController awakeFromRemoteView] + 692", "5 ViewBridge -[NSViewServiceMarshal _bootstrap:replyData:completion:] + 1828", "6 ViewBridge -[NSViewServiceMarshal bootstrap:withReply:] + 272", "7 CoreFoundation __invoking___ + 148", "8 CoreFoundation -[NSInvocation invoke] + 428", "9 CoreFoundation -[NSInvocation invokeWithTarget:] + 64", "10 ViewBridge -[NSVB_ViewServiceImplicitAnimationDecodingProxy forwardInvocation:] + 192", "11 CoreFoundation ___forwarding___ + 976", "12 CoreFoundation _CF_forwarding_prep_0 + 96", "13 CoreFoundation __invoking___ + 148", "14 CoreFoundation -[NSInvocation invoke] + 428", "15 CoreFoundation -[NSInvocation invokeWithTarget:] + 64", "16 ViewBridge -[NSVB_QueueingProxy forwardInvocation:] + 300", "17 CoreFoundation ___forwarding___ + 976", "18 CoreFoundation _CF_forwarding_prep_0 + 96", "19 CoreFoundation __invoking___ + 148", "20 CoreFoundation -[NSInvocation invoke] + 428", "21 CoreFoundation -[NSInvocation invokeWithTarget:] + 64", "22 CoreFoundation ___forwarding___ + 976", "23 CoreFoundation _CF_forwarding_prep_0 + 96", "24 CoreFoundation __invoking___ + 148", "25 CoreFoundation -[NSInvocation invoke] + 428", "26 ViewBridge __deferNSXPCInvocationOntoMainThread_block_invoke + 120", "27 ViewBridge __wrapBlockWithVoucher_block_invoke + 56", "28 ViewBridge kNotRunningOnAppKitCompatibleThread_block_invoke + 360", "29 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 28", "30 CoreFoundation __CFRunLoopDoBlocks + 364", "31 CoreFoundation __CFRunLoopRun + 2432", "32 CoreFoundation CFRunLoopRunSpecific + 612", "33 HIToolbox RunCurrentEventLoopInMode + 292", "34 HIToolbox ReceiveNextEventCommon + 648", "35 HIToolbox _BlockUntilNextEventMatchingListInModeWithFilter + 76", "36 AppKit _DPSNextEvent + 636", "37 AppKit -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 716", "38 ViewBridge __77-[NSViewServiceApplication vbNextEventMatchingMask:untilDate:inMode:dequeue:]_block_invoke + 136", "39 ViewBridge -[NSViewServiceApplication _withToxicEventMonitorPerform:] + 152", "40 ViewBridge -[NSViewServiceApplication vbNextEventMatchingMask:untilDate:inMode:dequeue:] + 168", "41 ViewBridge -[NSViewServiceApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 100", "42 AppKit -[NSApplication run] + 464", "43 AppKit NSApplicationMain + 880", "44 libxpc.dylib _xpc_objc_main + 976", "45 libxpc.dylib xpc_main + 108", "46 Foundation +[NSXPCListener serviceListener] + 0", "47 PlugInKit pkSafeDataFromRelativeURL + 33800", "48 PlugInKit pkSafeDataFromRelativeURL + 32752", "49 PlugInKit pkSafeDataFromRelativeURL + 34680", "50 ExtensionFoundation EXExtensionMain + 268", "51 Foundation NSExtensionMain + 204", "52 dyld start + 2236" ), com.apple.ViewBridge.error.description=NSViewBridgeErrorServiceBootstrap} error 23:24:30.455372+0900 Finder FP Custom action sheet failed to load with error Error Domain=com.apple.ViewBridge Code=14 "(null)" UserInfo={com.apple.ViewBridge.error.hint=-[NSViewServiceMarshal bootstrap:withReply:] caught NSInternalInconsistencyException 'attempting to send message to non-existent action extension view controller' with backtrace ( <same backtrace as above>), com.apple.ViewBridge.error.description=NSViewBridgeErrorServiceBootstrap}