Off hand, I'd say you did what you could to verify you should be able to get in, but what about dev accounts...how many accounts/teams are you on, and if more than one, did you sign out from all others at all store/account/backend attachment points to confirm the account you think you're using is the one the backend is talking to...? Otherwise, it might be the backend acting out yet again, and you just need to be patient and see if things clear up after a bit. Still no joy, consider contacting support directly, link below, and ask if they can take a look. Good luck.

How much ram in your MB? Did you restart and try again?

I achieved it using: XCODE 10.1i made my app just for MAC DESKTOP STORE Good info, thanks for the followup, good luck in the store.

 Xcode 11.7, Xcode 12 beta 6 and Xcode 12 GM seed.  Devs should never use any beta OS/SDK/tool for submittal to the store, ever, so b6 is out. 12 GM might fail right now if the backend hasn't been changed to accept it, and that is a distinct possibility, at least for the moment. Xcode 11.7 should work regardless. My guess is this isn't just about Xcode, but that you've also included a beta SDK, and/or built while on a beta macOS. As well, once an project has been touched by a beta Xcode, there may be traces left if you switch to a release Xcode, such as 11.7, where the store sniffs out those traces and rejects as above. Be sure when moving to release tools to 'clean-build-folder' on the project. I have to publish this app as soon as possible I assume you're targeting iOS 14.x (except that Xcode 11.x would not know about it...) - you might stick with iOS 14 GM, and Xcode 12 GM, but again, it is common that the last part of the puzzle is resetting the flag on the backend that says those versions are ok. It might mean waiting thru the day, or even into tomorrow, if we're lucky.  developed an app using Xamarin Forms and visual studio Pls. note that my reply is not an offer to troubleshoot 3rd party tools. Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.

I believe you need to join this ongoing thread: https://developer.apple.com/forums/thread/126314 Good luck.