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Disconnect Salesforce Authenticator from a User’s Account (Salesforce Orgs)
Only one Salesforce Authenticator mobile app can be connected to a user’s account at a time. If a user loses or replaces the mobile device where Salesforce Authenticator was installed, you can disconnect the app from their account. If a user’s app stops working, reset it by disconnecting the app; then ask the user to restore the app’s connection to their account by re-registering it. It’s also a good security practice to disconnect all of a user’s verification methods if they leave your company.

