Great thing your are talking about its very important in exchange website to set 2FA.
Google authenticator is awesome to use its really great app everyone need to use it.
If you set 2FA in any website you will get 100% Security in payment transactions.
Great thanks to @kingcrown for writing pos
post on 2FA.
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in fact google authenticator does not deserve that much of credit since if you loose the phone there is no way to recover, unless u are only using it for google signin 2FA
Good to know.