Answer
Lightning Payroll supports authenticator apps (Google Authenticator, Microsoft Authenticator, or any other TOTP app) as an alternative to the emailed one-time code. Once set up, you can enter the 6-digit code from your app at the login screen instead of waiting for an email. See also: How Do I Use Two-Factor Authentication With My Lightning Payroll Account?
Setting Up the Authenticator App for Your Own Account
In the online (web/mobile) app, open Licence Details from the top navigation bar. Scroll to the Two-Factor Authentication section. A QR code is displayed alongside a text Key. Open your authenticator app, add a new account, and scan the QR code ÔÇö or enter the key manually if you prefer. The app will then generate a fresh 6-digit code every 30 seconds.

Setting Up the Authenticator App for Another User
Account owners and admins can display the QR code for any sub-user. In the online app, go to Settings >> User Management. In the users table, click the QR code icon button (Show Auth App QR Code) in the row for the user you want to configure. A modal displays that user's QR code. Have the user scan it in their authenticator app, then click OK to dismiss.

Setting Up the Authenticator App for Employee Portal Access
Employees who use the employee portal can set up their own authenticator app. After logging in to the employee portal, the Authenticator App panel on the dashboard displays a QR code and a Secret key. Scan the QR code with any TOTP app, or enter the key manually. Keep the key private ÔÇö if access to the app is ever lost, the emailed verification code can still be used to sign in.
Using the Code at Login
Once the authenticator app is set up, enter the current 6-digit code from the app at the verification prompt after logging in. Both the emailed code and the authenticator code remain valid; either can be used at any time.
In the desktop app, the same authenticator app code is accepted at the Verify 2FA/OTP Code prompt when connecting to your online account.