I have a CC2531 stick that works properly with my Windows instance, but if I use it in my Pi 4 with the same configuration (port changed obviously) it doesn’t add new devices. It has access to the port and correctly reports it’s status to my MQTT server.
I have no clue about this and researched it every where. Maybe it’s some interference thing, but the Pi is milimeters away from the device I want to pair it with so that doesn’t seem that possible.
It’s worse than that: I’ve had the Raspberry Pis toast their micro-SD card storage when the power supply/power cable is less than ideal. The genuine Raspberry Pi power supplies are relatively cheap and work very well.