First, you need to create a sandbox account in App Store Connect. Then, on an actual device, go to Settings > Developer and scroll to the bottom. There's a "Sign In" button below the "SANDBOX APPLE ACCOUNT" heading. Sign in with the email and password of your new sandbox account. You can then make purchases and refunds in your app on the device. Try that, and if it doesn't work, come back and tell us exactly what steps you take, and tell us the exact text you see on the screen. As @endecotp said, we don't know what you mean, so being a little clearer would help.

These are the Developer Forums, where developers of apps for Apple's platforms ask each other for hints and tips on coding. Your question is more of a product support one, so I'd suggest you ask it over at the Apple Support Forums. Thanks.

Alright, chill. Have you tried doing this in a web browser on a computer rather than in the mobile app?

You've written a game and it targets all platforms? And you want to release just the iOS version on its own? Then you want to release the macOS version? Then you want to release the tvOS version? No. You release ONE version that targets ALL the platforms. Apple will reject any attempt to release multiple identical versions of an app/game targeting one platform at a time. It's in the rules. Also, as a consumer, this would be extremely annoying and is likely to put me off bothering with your stuff.

Thanks for signing up to the developer forums - the place where random developers from around the world get together to help each other with their coding issues on writing apps for Apple's platforms. You're in the wrong place. Try Xitter.

Anything on this page help? Since you say your iOS app works fine, it might be that you've got the wrong code signing identity against macOS.

Not sure, total guess here, but what happens if you put these two lines inside UIView.animate(withDuration: 0.5), like this: UIView.animate(withDuration: 0.5) { widthConstraint.constant = 120.3 heightConstraint.constant = 114.0 self.view.layoutIfNeeded() }

Two things: Apple aren't scamming you. They will happily refund one of the charges. Use paragraphs.

Do you want to write the app once or twice? Write it in SwiftUI and extend when SwiftUI doesn't fulfil your requirements. Swift/SwiftUI is the future. If you write it with AppKit you might have to re-write it later on.

And what code is it that's failing? Honestly, we cannot do anything without seeing any code. Why do people not get this?

Does the app launch and show the launch screen correctly? If so, I'd leave it as it is. The same thing happens to my apps. You can raise it as a bug if you want: https://feedbackassistant.apple.com/ then post the FB number here.

What do you mean by you "use the Mail function"? Do you mean the mail command (type it in the Terminal), or do you mean the Mail application? If you mean the application, then I'm afraid you're in the wrong place. These are the Developer Forums, where developers of apps for Apple's platforms ask each other for hints and tips on coding. Your question is more of a product support one, so I'd suggest you ask it over at the Apple Support Forums. Thanks.

This is not really something we random developers on here can handle - we don't work for Apple and have no access to their systems. The only thing you can do with your Apple Developer account is remove the user so they don't have access. What you need to do aside from that is make sure that developer has zero access to your code and systems. We don't know what systems you use, so that's for you to do, not us.

Microsoft may say that nothing has changed on their end, but that just means they haven't really checked. They're telling you they haven't changed anything in the OneDrive app, but if something in iOS/iPadOS has changed and it has adversely affected OneDrive then it is up to Microsoft to adapt their app to work with the new version of iOS/iPadOS. You should go back to Microsoft and raise a bug in their OneDrive app.