How to filter on DeviceManagement.WindowsAutopilotDeviceIdentities

[stephannn]

Hi,
i try to filter on the Serial Number:

var filter = $"contains(serialNumber, '{request.SerialNumber}')";
            _logger.LogInformation("SerialNumber filter value: {sn}", filter);
            var existingDevices = await _graphServiceClient.DeviceManagement.WindowsAutopilotDeviceIdentities
                .Request()
                .Filter(filter)
                .GetAsync();

but this just returns a bad request. I am afraid when I do:

var allDevices = await _graphServiceClient
                .DeviceManagement
                .WindowsAutopilotDeviceIdentities
                .Request()
                .GetAsync();

            var existingDevices = allDevices
                .FirstOrDefault(d =>
                    string.Equals(d.SerialNumber, request.SerialNumber,
                                StringComparison.OrdinalIgnoreCase));

it will fail when I start having thounds devices

[MartinM85]

Bad request usually means that the operator (contains) is not supported.
Have you tried to use eq?

var filter = $"serialNumber eq '{request.SerialNumber}'";
            _logger.LogInformation("SerialNumber filter value: {sn}", filter);
            var existingDevices = await _graphServiceClient.DeviceManagement.WindowsAutopilotDeviceIdentities
                .Request()
                .Filter(filter)
                .GetAsync();