Same here, stuck for 12 hours. Tried uploading a new version, also stuck.

Guys I got mine to work in the following way: (Apple clearly isn't coming to the rescue, they're like the DMV at this point, so maybe this will help somebody...) NOTE: All my apps use Expo and eas build (which I run locally). I had 4 builds for the same app stuck in Processing purgatory. So I tested another app in another dev account, and it worked. This was a clue. I tried making swift changes, bundle version changes, everything, and it didn't work at all. So I ran expo prebuild, opened the app in Xcode, old school method, I didn't change any code at all, just the bundle version AND build number, and I ran Archive. Then I submitted it to App Store Connect from inside Xcode, and it worked. Who knows why, but it worked, and my other builds are still endlessly processing. There you go. Good luck out there everyone