I just purchased a Yubikey 5 NFC. I want to use it to make my accounts a little more secure. I have added 2fa to my facebook account and I have added that key to my yubikey. So far, so good.
Now I have downloaded the Yubico Authenticator. I understand I need this to read a key through NFC off my yubikey.
But when I try to add a new account to my authenticator I get asked stuff like SHA algorithm (1, 256 or 512). Is it counter based or time based? Etc. How do I know which of these settings facebook uses for their keys?
Or have I totally misunderstood the concept?