Getting the same error, this helped for me:https://cordova.apache.org/howto/2020/03/18/wkwebviewonly.html
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I've 2 apps with about a dozen builds uploaded in the last month and all stuck "in processing ...". forever.
There is a Connect app notification popping up in the iPhone that says "there is a problem". But that's all info.
All prior builds did upload and process just fine and the apps didn't change much. It sure seems a problem with the tools...
You lucky ones :-)
All my builds uploaded till mid-December '24 are still stuck in processing ...