That’s exactly the order for me. My iTunes account was so old that it wasn’t even an email address, it was just a username. I don’t mind the two separate accoun

That’s exactly the order for me. My iTunes account was so old that it wasn’t even an email address, it was just a username. I don’t mind the two separate accounts for iCloud vs iTunes, but was annoyed when Apple aggressively started trying to force me to change away from a “username” to an account login based on an “email address”. I finally caved and did it a while back, being told that I wouldn’t need to re-login on every device, but that turned out to be a lie. I’ve also had to call Apple three times to get some kind of “security alert” cleared on the account (they seem to immediately know the issue and fix it quickly, but won’t describe why it happens) following the change or otherwise I’m blocked from making purchases.