System.formatexception : format string can be only "G", "g", "X", "x", "F", "f", "D" or "d".

public async Task<ClientTotalResponse> ExecuteAsync(ClientTotalRequest totalRequest)
      {
          // Defining path using provided "options" value
          var path = $"{_options.Value.BaseUrl}/" +
              $"{_options.Value.TotalReportEndpoint}?" + "date=" +
              $"{_options.Value.DateQueryParameterName = totalRequest.ReportDate.ToString(_options.Value.DateQueryFormat)}&" + "iso=" +
              $"{_options.Value.IsoQueryParameterName = totalRequest.CountryIsoCode}";

          // Getting response
          HttpResponseMessage response = await _totalReportClient.GetAsync(path);

          // Checking if response status is 200
          if (response.IsSuccessStatusCode)
          {
              // Reading content of received response
              var responseData = await response.Content.ReadAsStringAsync();
              var result = JsonSerializer.Deserialize<ClientTotalResponse>(responseData);
              _logger.LogInformation($"Request is {JsonSerializer.Serialize(totalRequest)}.", LogLevel.Information);
              _logger.LogInformation($"Response is {JsonSerializer.Serialize(result)}.", LogLevel.Information);
              return result;
          }

          // If we got that far, something is wrong and returning null
          _logger.LogError("Failed to execute report request.", LogLevel.Error);
          return null;
      }

[Test]
    public async Task On_ExecuteAsync_Should_Use_Logger_If_OK()
    {
        // Arrange
        var response = new HttpResponseMessage
        {
            StatusCode = System.Net.HttpStatusCode.OK,
            Content = new StringContent("{}")
        };

        _httpMessageHandlerMock.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.IsAny<HttpRequestMessage>(),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(response);

        // Act
        var result = await _client.ExecuteAsync(_reportTotalRequest);

        // Assert
        _loggerMock
            .VerifyLogging($"Request is {JsonSerializer.Serialize(_reportTotalRequest)}.", LogLevel.Information)
            .VerifyLogging($"Response is {JsonSerializer.Serialize(result)}.", LogLevel.Information);
    }

Message: 
System.FormatException : Format string can be only "G", "g", "X", "x", "F", "f", "D" or "d".

  Stack Trace: 
Enum.ToString(String format)
Enum.ToString(String format, IFormatProvider provider)
ValueStringBuilder.AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args)
String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
String.Format(IFormatProvider provider, String format, Object[] args)
FormattedLogValues.ToString()

public record ClientTotalRequest
{
    public string CountryIsoCode { get; init; }
    public DateTime ReportDate { get; init; }
};