The two factor is turned on or off at the service provider end. The authenticator app is nothing more than a code generator. Without a backup to restore from the only option is to work with each of the service provider's account recovery methods. Open the Authenticator app, select the plus icon and select Add account, and then select Work or school account, followed by Scan a QR Code. This check is important so we can be sure we're not overwriting or erasing an existing account by mistake. For example, if you're recovering your personal Microsoft account, you must make sure you don't have a personal Microsoft account already set up in the authenticator app. Sign in to your account which you used earlier on.
Launch the Authenticator app and tap on Restore from backup from the welcome screen. You can recover your account credentials from your cloud account, but you must first make sure that the account you're recovering doesn't exist in the Microsoft Authenticator app. Install Microsoft Authenticator for Android or iOS. Then sign on with recovery account to do the restore. If you ONLY allow Microsoft Authenticator the user needs to call the helpdesk to get their MFA methods reset and add a new Microsoft Authenticator on a new phone they get from somewhere. You can restore from backup (assuming there was one) but make sure no accounts have been added to the newly install app. If you allow SMS/Phone Call they can sign in using this method.
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