Small remark

src/Core/Models/Api/Fido2CredentialApi.cs

@@ -21,6 +21,7 @@ namespace Bit.Core.Models.Api
             RpName = fido2Key.RpName?.EncryptedString;
             UserHandle = fido2Key.UserHandle?.EncryptedString;
             UserName = fido2Key.UserName?.EncryptedString;
+            // Username is already implemented? But userDisplayName is missing?
             Counter = fido2Key.Counter?.EncryptedString;
             CreationDate = fido2Key.CreationDate;
         }