Log in to your Zoho Account, but after supplying your username and password you will be asked to insert your Fido key;
Insert your key into an available USB port, then at the "Security key PIN" prompt, supply the PIN code for your Fido2 key, then click 
;
You will now be asked to touch the Fido2 key (in the case of a Fido key with a fingerprint reader you will need to swipe your finger on the key);
Once the key has been touched you will be logged in to your Zoho account.