The company I work for created an app, we uploaded it to app and it was rejected for some Meta data. No big deal really, except that management then decided to build a new v
I created my iOS App ID and immediately after tried to register my app, but received the error message "The Bundle ID you entered has already been used." I tried again a few hours later -- by then, Apple had logged me out so I had to log back in.
When I tried again, it worked with no errors. Not sure if it was the time delay or the log out / back in.
The answer is to create a new bundleID, update your app, and submit a new app with a slightly chanced name to Apple. No other options as far as I have seen.
bundleID is unique ID by which application can identified. If bundleID is already exist then you delete that bundleID first.
There's a bug or 'trick' on iTunes Connect that let's you use the same name after you have deleted it.
Full details here: https://hesh.am/2012/01/25/recovering-a-deleted-app-name-in-itunes-connect/