I used XCode 12 in Big Sur 11, downloaded from App Store. But today, Apple doesn't allow me to upload my game through XCode anymore with this message: all ios apps submitted to the app store must be built with the ios 15 sdk Xcode 13 So I tried to update XCode to 13, but App Store doesn't allow me because my macOS is not 12. But I found on the official apple website that XCode 13.2 is available in Big Sur 11.3, so I just updated my macOS to Big Sur 11.6. https://developer.apple.com/support/xcode/ But still, I was not allowed to download XCode 13 from App Store and I found apple's official webpage that can download XCode versions manually. So I downloaded 13.2.1 with something called command-line-interface, uninstall the XCode 12, and install both. I put the XCode.app into the Applications directory. Launching XCode 13.2 was successful without any error, but the build of my project always failed with this message: xcode-select: error: tool 'actool' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance So I searched about it, but nothing related was found. I already tried this: $ sudo xcode-select -s /Applications/Xcode.app/Contents/Developer But nothing changed. Still, I see the same error message. I'm pretty sure that installing XCode by downloading it causes this trouble. But there's no OS update available on my MacBook because Big Sur is my last supported version, and App Store does not allow me to download XCode 13. How do I solve this issue? What am I missing?

My game already contains various IAP Products and passed an Apple's Review a few days ago. However, I submitted a new version today that includes a new IAP product, but Apple rejected my submission due to the failure of purchase. In the Testflight with Sandbox account, there was no issue with the purchase. The only they gave to me is just the screenshot of when the purchase failed. Here's what they told me: We found that your in-app purchase products exhibited one or more bugs when reviewed on iPad running iOS 14.3 on Wi-Fi. Specifically, the app displayed an error message after completing the payment. After some research, I found that some people having a similar issue got a response from Apple that there is a problem with App Review Test Network. Even there was the same man who just resubmitted rejected app without changed anything, but it was approved. The IAP works in the Testflight with Sandbox environment without any problem. Is there anything that I missed?