The YubiKey 5 series have five separate applications, all of which have different processes for being reset. Each application is listed below, along with the link to the article that covers the steps for resetting it.
|OTP||Resetting the OTP Application on the YubiKey|
|FIDO U2F / FIDO 2||Resetting the FIDO-U2F / FIDO2 Application on Your Yubikey|
|PIV (Smart Card)||Resetting the Smart Card (PIV) Application on Your YubiKey|
|OATH||Resetting the OATH Application on the YubiKey|
|OpenPGP||Resetting the OpenPGP Application on Your YubiKey|