Log in to your Rublon account, then select the option "Security Keys";
After logging in you will be presented with the currently available authentication methods.
To ad Fido2 keys as an authentication method click on the option 
;
Before adding an new authentication method you will first need to confirm your identity using one of the currently added methods;
Click on one of the currently available options and after verifying your identity click on the 
button;
You can now add your Fido key as an authentication option by selecting the option "WebAuthn/U2F Security Key (hardware token)", then clicking 
;
You will now be prompted to specify the device that is to be added as a passkey.
Select the option "Security key", then click 
;
You are now notified that access to google will be prepared with your Fido2 security key - click 
to proceed to the next step;
You will be asked to touch the button on your key (if your model has a fingerprint reader you may be asked to provide a finger swipe instead);
You will now be prompted to enter the PIN code for your Fido2 key.
At the prompt "Security Key PIN", enter the PIN code, then click 
.
(in the case of a Fido key with a fingerprint reader you will need to swipe your finger on the key);
You are now prompted to touch the key (to prove you are present and giving permission for the key to be used).
Touch the necessary area on your Fido key;
Once you have touched the Fido2 Key will be added as a passkey authentication method to your Rublon account.
Click "OK", and you will be asked to provide a name for the key. Supply a suitable name then click 
You will now find that the icon for the Fido security key is now enabled (the fingerprint icon indicated below);
