This is one of those freaking problems which you may encounter on App Store Connect for which there is no explanation and no solution.
When you try to create a new app on app store connect it will show you the following error even though you have already created a new Bundle Id on Apple’s developer account.
You have no eligible Bundle IDs for iOS apps.
Register one here
Unfortunately there is no solution to this problem.
All you can do is to wait for hours or days in worst case and retry.