public async Task <CacheItem> ExecuteAsync(string fido2Payload, CacheItem relatedItem)
        {
            var request = OwnIdSerializer.Deserialize <Fido2RegisterRequest>(fido2Payload);

            if (string.IsNullOrWhiteSpace(request.AttestationObject))
            {
                throw new CommandValidationException("Incorrect Fido2 register request: AttestationObject is missing");
            }

            if (string.IsNullOrWhiteSpace(request.ClientDataJson))
            {
                throw new CommandValidationException("Incorrect Fido2 register request: ClientDataJson is missing");
            }

            var fido2Response = new AuthenticatorAttestationRawResponse
            {
                Id       = _encodingService.Base64UrlDecode(NewUserId),
                RawId    = _encodingService.Base64UrlDecode(NewUserId),
                Type     = PublicKeyCredentialType.PublicKey,
                Response = new AuthenticatorAttestationRawResponse.ResponseData
                {
                    AttestationObject = _encodingService.Base64UrlDecode(request.AttestationObject),
                    ClientDataJson    = _encodingService.Base64UrlDecode(request.ClientDataJson)
                }
            };

            var options = new CredentialCreateOptions
            {
                Challenge = _encodingService.ASCIIDecode(relatedItem.Context),
                Rp        = new PublicKeyCredentialRpEntity(
                    _configuration.Fido2.RelyingPartyId,
                    _configuration.Fido2.RelyingPartyName,
                    null),
                User = new Fido2User
                {
                    DisplayName = _configuration.Fido2.UserDisplayName,
                    Name        = _configuration.Fido2.UserName,
                    Id          = _encodingService.Base64UrlDecode(NewUserId)
                }
            };

            var result = await _fido2.MakeNewCredentialAsync(fido2Response, options, args => Task.FromResult(true));

            if (result == null)
            {
                throw new InternalLogicException("Cannot verify fido2 register request");
            }

            var publicKey = _encodingService.Base64UrlEncode(result.Result.PublicKey);

            return(await ProcessFido2RegisterResponseAsync(relatedItem, publicKey, result.Result.Counter,
                                                           _encodingService.Base64UrlEncode(result.Result.CredentialId)));
        }