Is now u_e-fido2.md

docs/model-fido2.md

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-## How is UV handled in mailcow?
-
-The UV flag (as in "user verification") enforces WebAuthn to verify the user before it allows access to the key (think of a PIN). We don't enforce but prefer UV to allow logins via iOS and NFC (YubiKey).
-
-## Login and key processing
-
-mailcow uses **client-side key processing**. We ask the authenticator (i.e. YubiKey) to save the registration in its memory.
-
-A user does not need to enter a username. The available credentials - if any - will be shown to the user when selecting the "key login" via mailcow UI login.
-
-When calling the login process, the authenticator is not given any credential IDs. This will force it to lookup credentials in its own memory.
-
-## Who can use WebAuthn to login to mailcow?
-
-As of today, only administrators and domain administrators are able to setup WebAuthn/FIDO2.
-
-## iOS problems
-
-Please use a desktop computer to register your key with your mailcow account.
-
-The process was tested using a YubiKey with Chrome on Windows. When registering a new, empty key, you will be prompted for a PIN for the new YubiKey. Once set and confirmed, the credentials are stored on the key. Using it with iOS works flawless now.
-
-iOS seems not to be able to set a PIN on the device on first use, so please use a desktop computer for this step.