fix approve this iphone stuck

Often, the issue of "Approve This iPhone Stuck" happens if it has difficulty with authentication on iOS 11/12/13 while working with iCloud. After the analysis, it is found that several possible factors contributing to "Can't approve this iPhone" as shown above, can be summarized as the enabled iCloud keychain and two-factor authentication or problems with iPhone itself. Although this is undeniable that signing in to iCloud to approve the iPhone is to ensure higher security, sometimes, it will also put you in trouble. As a result, what this article mainly discusses is how to get you out of it with 3 mature solutions.