If the NOAHlink can pair but is not able to be discovered in NOAHlink Properties, check if you are on Windows 10 and have the Spring update 1803. If so, be sure that you have installed KB4340917, full details on this Microsoft Bluetooth issue and NOAHlink can be found here.
If you are not on Windows 10, or are on a fully updated Windows 10, and cannot discover the NOAHlink in NOAHlink Properties, check this page for connectivity issues and solutions.