Changing apple ID
I want to change my apple ID from one 1 iCloud address to another iCloud address. I have added the address I wish to change to, let’s call it “new-address@icloud.com” to my “reachable at” in my apple profile, and have successfully signed into and added the new address to my mailbox.
My problem: When I log into appleid.apple.com and enter my email “new-address@icloud.com” it says “You can only add the @icloud.com address that is already on file in your account.”
What does this error mean? How do I change my appleid to the new address? I could not find this error mentioned anywhere.
iPhone 13