Cannot sign in to Apple ID to reinstall macOS

The cause is usually related to an Apple server security lock, connection issues, or Two-Factor Authentication.

Try these troubleshooting steps one at a time and in this order:

1. Go to Settings > General > Date & Time and turn on Set Automatically (incorrect time settings block Apple servers).
2. If a verification code prompt doesn't appear, enter your Apple ID password followed directly by the 6-digit verification code with no spaces (e.g., password123456).
3. Go to appleid.apple.com from another device to ensure your account isn't temporarily locked.
4. Press and hold the power button and either volume button until the Apple logo appears, then try again.