approve iphone from icloud
How do I approve my iphone from another device?
iPhone XS, iOS 13
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Check this:
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If you don’t have a trusted device handy, you can have a verification code sent to your trusted phone number as a text message or phone call.
- Click Didn't get a verification code on the sign in screen.
- Choose to have the code sent to your trusted phone number.
- You'll get a text message or phone call from Apple with your verification code.
- Enter the code on your other device to complete sign in.
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copied from: Get a verification code and sign in with two-factor authentication - Apple Support