Thank you WyFry, it really solved the issue and it really took 1-2 hours to see the changes. :) I think I may understand why it solved the issue, but sometimes it amazes me how complicated and deep this whole app-store and the apple-release thing is.

I also face the same problem. Phone: iOS 14.7.1 (18G82) Model: iPhone 7 (Model 1660, 1778, 1779, 1780) XCode: Version 13.0 (13A233) Error: Failed to prepare device for development. Error Details: The device rejected the pairing attempt. Domain: com.apple.dt.MobileDeviceErrorDomain Code: -402653035 Similar issue found: https://developer.apple.com/forums/thread/672986 Suggested solution in that issue: restart the phone Didn't work for me I'm still searching for a solution... [UPDATE] After updating the iPhone to iOS 14.8 (18H17), the error message changed. New error message: Could not locate the device support files. Xcode could not determine the product version. If you are using a supported combination of Xcode and hardware, please reboot and unlock all devices (including the host mac), and respond to any outstanding pairing requests. [UPDATE] Tried to manually download and paste Device Support files from this GitHub repo: https://github.com/filsv/iPhoneOSDeviceSupport Pasted it into the folder, still didn't work for me. [SOLUTION] I'm not exactly sure what was the problem, but it was regarding the podsfiles. I use Flutter, and after flutter clean, flutter run did wonders, and the app started on the phone

Answer by dory2380 should be the accepted answer. There is a button indeed, called "Register device" under Signing and Capabilities.