When you've confirmed that all of your accounts have transferred and are working on your new phone, you can safely delete the Microsoft Authenticator app from your old phone.

Tap the trashcan. On the confirmation box, tap Remove account. Remember that removing an account from the Google Authenticator app doesn't affect the status of 2FA on the account itself.

It is important to mention here that the Authenticator app collects Account info you provide when you add your account. If you have any apprehensions regarding this, you can remove it by simply ...

Using two-factor authentication (2FA) apps ensures your account is safe behind ... You can now use Authenticator on both phones or delete it from your old device. The previous methods should ...