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Requirements for Salesforce Authenticator
The Salesforce Authenticator mobile app is supported on various mobile platforms, with some device, operating system, and mobile browser requirements. You need an Internet connection to communicate with Salesforce for user verifications of account activity and location-based automated verifications. The app generates verification codes as time-based one-time passwords, or TOTPs without an Internet connection on your mobile device, so you can still log in to your other accounts when you're offline.

