Missing Provisioning Profile - App must contain a provisioning profile

Question

my code is programmed with Ionic / Cordova, but that should not be part of the problem. I have the following problem:

I have an old account at Apple, from which I no longer know the security queries and thus I can not do the 2-way authentication. The developer account is therefore no longer available. So I have created a new Apple ID and the new account in the old as admin invited and wanted to at least update the apps there.

I have also created corresponding certificates for the new Apple ID. When I upload the app I get the following error message: App Store Connect Operation Error

ERROR ITMS-90174: "Missing Provisioning Profile - App must contain a provisioning profile in a file name embedded.mobileprovision.

I have not yet created Provisioning Profiles because I can not create an App ID. There is always the error message

There were errors in the data supplied. Please correct and re-submit.

An App ID with identifier 'com.domainname' is not available. Please enter a different string.

The problem is with the BundleID, which I can not create. Every other one is successful, just not that particular one. Is it because it's already in use? The BundleID but should still be as I have deposited it in the app. That is also so, I have made it several times already by copy & paste, so I do not have any spelling mistakes, but I just can not enter this BundleID to me to create the correct AppID and without AppID I get of course not my Provisioning Profiles created and probably the first error message, right?

Can someone help me? With the old Apple ID I'm on the developer account everywhere else on it. I can not perform 2-way authentication because of the lack of answers from the security queries.