It should be noted that some phone cameras now have proper IR filters on their camera. If you don't see light coming from the end of a known working IR source (such as a tv remote with a button held down) then you should try another camera - often the forward facing 'selfie' camera will work instead.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
