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I was in the same situation and while tinkering with it, i got into mess where Apple was trying to send me verification email which i was not receiving it. I had to call Apple Support and while on the phone i was sharing my screen to her. She walked me through entire thing and changed my apple ID to
@icloud one. I'll list out the steps below. But be warned you might get locked out and it will be on you. Obviously you can always get help from Apple support.
Scenario : My
@gmail Id was my apple ID.
@icloud was my primary ID.
steps
1. I tried changing the Apple ID (
@gmail) to @icoud. It threw error that my apple id cant end in @icloud.com.
2. I tried changing my primary email to my
@gmail account, which was again not happening.
3. Then i changed the primary email (
@icloud) to
@outlook (which was never associated with Apple ever - i dont know if that is required.) So now
@icloud ID is not in the scene anymore. Apple ID is still
@gmail but now primary ID is
@outlook.
4. This is where i got stuck. Now when i I tried loging back into icloud.com, which would sent me verification over my iphone. After this verification code, there was one more verifcation code sent to me
@gmail ID. BUT this email never reached. I tried multiple times and asked to resend multiple times. But i would not get that verification email. I would always get pass the 1st verifcation (on the iphone - which shows a little map and asks to allow etc.) But just wouldn't get the 2nd verfication code over email. I checked spam, trash, deleted all my filters which i created over so many years, but nothing.
Now its time to call Apple. She walked me through the process. we were on the phone as well as i was screen sharing my comp. She was able to see and annotate over screen
5. First I tried logging on the appleid.apple.com. Which again, got through the first verifcation over the phone. When the second verification box shows up, there she told me to changed the
@gmail ID to
@outlook ID which i did and pressed continue (to recieve the code on this
@outlook ID instead). This time it went through without requiring the verification code and i was able to login and i could see my account page with the all the info.
6. So now, it showed
@outlook as my Apple ID. So basically with all these ups n down, all i managed was to get from one third party email to another third party.
7. Then i told her that i wanted my
@icloud ID as my apple id and others can be primary.
7. She asked me for a support pin verifcation to check my identication in order move further. Which i did.
8. After this support pin verification she asked me click on change Apple ID. Which showed a box to enter the new one (just like before). I typed my
@icloud ID and clicked continue/ok. THIS TIME IT SIMPLY ACCEPTED.
9. So finally, now, it shows
@icloud ID as Apple ID.