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Go to your Apple device's App Store and search for Authenticator App for Instagram or if you can't find it in the App Store, click this button Download on App Store
To receive a 6-digit code on your device via Authenticator App, you'll need to copy the given key from the Instagram app and enter it in the Authenticator App to link it to Instagram.
The first thing to do is to check for an email from Instagram indicating that the email address associated with your account has been changed. This is the easiest way for hackers to gain access of your Instagram account. However, if you can find the email, you can reverse the action right away.
If Authenticator App codes not working, this issue might be related to your device's time sync problem. To fix it, turn on Set Automatically in Settings > General > Date & Time. This will set your date and time automatically based on your time zone.
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