Send @M0SAIC a private message and they should be able to help you diagnose the problem.
Meanwhile one way to make sure the COM port your using is the right one is to see if it vanishes from the select-able list when you disconnect it. (just make sure to refresh it) Though the device should also do a jerking servo movement when you connect to it.
Additionally maybe seeing if the device moves or shows up on intiface central might help too with seeing the problem, I posted a guide here: https://discuss.eroscripts.com/t/osr2-sr6-to-intiface-central-connection-unofficial-rough-guide/156325?u=ratattack15 Since the program itself shows a debug log and if you follow the steps in the guide you should end up with moving the OSR2 up and down and be able to connect to it if you have the right COM port and nothing else is messing up.