All you have to do is scan a QR code for the service you want to turn 2FA on for, and the app will generate a new log-in code around every 30 seconds.

Transfer Confirmation: Once all QR codes have been scanned, the Google Authenticator app on your new phone will display a confirmation message, indicating the successful transfer of your accounts.

I prefer the option to use an authenticator app rather than receiving codes via text message whenever possible, and so should you. The reason is simple logistics.

Authenticator apps typically work by generating time-based one-time passwords (TOTPs), which are unique codes that refresh every 30 seconds.

Once enabled, an authenticator app can be used to scan the QR code displayed, which confirms the device and enables TOTP.

On your new phone's Authenticator app, tap Scan QR code. After you scan your QR codes, you get a confirmation that your Google Authenticator accounts were transferred. You can remove your exported ...

The one-time codes that Google’s Authenticator app generates to secure your accounts no longer have to live in one place. Instead, they can sync to your Google account. This update announced ...

If your Microsoft Authenticator app is not working or displaying code for the accounts, then follow the suggestions to fix the issue using multiple methods.