Change my current Apple ID

You can change your apple id's mailadress without affecting your apps and subscriptions

How to change your Apple ID to a different email address

1. Go to appleid.apple.com and sign in.
2. In the Sign-In and Security section, choose Apple ID.
3. Enter the email address that you want to use as your Apple ID.
4. Choose Change Apple ID.
5. If you changed your Apple ID to a third-party email address, check your email for a verification code, then enter the code. Learn what to do if you didn't get the email.
6. If you use services like iCloud or Messages to share with friends and colleagues, sign in to those services with your updated Apple ID.

If you can't change your Apple ID

If you try to change your Apple ID to an @icloud.com email address that was created within the last 30 days, you will be asked to try again later.

If you see a message that the email address you want to use isn't available or is already in use, check that you or a family member aren't already using that email address with a different Apple ID. If a family member is using that email address, remove it from their account then try to use it. 

In some countries or regions, you can use your phone number as your Apple ID. But if your Apple ID is an email address, you can't change it to a phone number.

If you want to login to a new Apple ID rather then change the current Apple ID, this is not possible without losing access to your subscriptions and bought applications.

To get things straight: you tried to change your Apple ID to a new iCloud address. You will need to wait 30 days before you can change your Apple ID to a recently created iCloud adress. That could be the issue you're experiencing