since to enter my watchguard account I use the authpoint MFA (free without having any license) is it possible to apply the same thing to the web Ui login interface of my watchguard?
The firebox supports external authentication servers (such as RADIUS) that support MFA.
-If you manage your device via WatchGuard Cloud, you can choose to use WatchGuard ID (MFA via WatchGuard.com) for that.
-If you prefer to manage your device locally, you can use any RADIUS based MFA solution (such as AuthPoint) to require MFA. To use AuthPoint to accomplish this, you would need to purchase a license for it.
WatchGuard Customer Support
Thank you James