The Multi-Factor Authentication (MFA) code for logging into GRATIS is valid for 5 days, but only if the user remains in the same browser session.
If the user closes the browser or opens GRATIS in a new browser (or in incognito/private mode) or device, this starts a new session, and a new MFA code will be required.
The 5-day validity is tied to the session in the same browser and device. Changing browsers, devices or clearing session data will prompt for a new MFA code.
This means users may receive multiple MFA codes if they access GRATIS from different browsers, devices or after closing and reopening their browser, even within a 5-day period.