How do I approve of my iPad with my iPhone?
How do I approve my iPad from my iPhone?
iPad, iOS 10
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This isn't a chat site.
If you have 2 Factor Authentication enabled, are you getting a verification code?
See if anything here helps. If necessary, you can use account recovery as explained in the link at bottom of the article.
Verification code - how to get one and sign in with two-factor authentication.