Both the IT Glue web application and IT Glue 'Offline' extension share the same MFA/Secret Key. Resetting MFA in IT Glue renders the MFA in offline mode unusable, resulting in an 'Invalid Error' when attempting to log in to the Offline Mode extension. After an MFA reset in IT Glue, it is essential to reinstall IT Glue's sync service. You can accomplish this by navigating to the following drive path: C:/Program Files/IT Glue/IT Glue Offline Mode/itg-offline-mode-installer.msi and reinstalling Offline Mode.