Using the Fruitbasket as the reference, I've configured a Xamarin.Mac(C#) based app to use File Provider. I'm throwing NotAuthenticated error and see a sign in button on the CloudStorage. When I click on the sign in button, my FPUIActionExtensionViewController class isn't being triggered. I see the following message in the Console logs. Action with identifier (com.apple.FileProviderUI.authenticate) did finish with error (Error Domain=com.apple.ViewBridge Code=14 "(null)" UserInfo={com.apple.ViewBridge.error.hint={ callStackSymbols =( "0 CoreFoundation__exceptionPreprocess + 242", "1 libobjc.A.dylibobjc_exception_throw + 48", "2 Foundation-[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 267", "3 FileProviderUI-[FPUIActionExtensionContainerViewController _configureWithDomainIdentifier:] + 170", "4 FileProviderUI-[FPUIActionExtensionContainerViewController awakeFromRemoteView] + 851", "5 ViewBridge-[NSViewServiceMarshal _bootstrap:replyData:completion:] + 2235", "6 ViewBridge-[NSViewServiceMarshal bootstrap:withReply:] + 245", "7 CoreFoundation__invoking___ + 140", ) I get the similar error when I click on custom action Action with identifier (com.your-company.Action.CustomAction) did finish with error (Error Domain=com.apple.ViewBridge Code=14 "(null)" UserInfo={com.apple.ViewBridge.error.hint={ callStackSymbols =( "0 CoreFoundation__exceptionPreprocess + 242", "1 libobjc.A.dylibobjc_exception_throw + 48", "2 Foundation-[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 267", "3 FileProviderUI-[FPUIActionExtensionContainerViewController _configureWithDomainIdentifier:] + 170", "4 FileProviderUI-[FPUIActionExtensionContainerViewController awakeFromRemoteView] + 851", "5 ViewBridge-[NSViewServiceMarshal _bootstrap:replyData:completion:] + 2235", "6 ViewBridge-[NSViewServiceMarshal bootstrap:withReply:] + 245", "7 CoreFoundation__invoking___ + 140", "8 ). Has anyone seen this issue before? Any suggestions or direction for troubleshooting this issue?