sorry, it's V3.12.3.
and we, of course, tested it on SWITCH OS 4.1.0 the latest one.
we think you may try the following things:
1. connect Cross Hair to SWITCH with no peripheral plugged in it
2. open "System settings"->"System"->"Console NickName",
and when virtual keyboard is enabled, plug your keyboard directly in SWITCH,
and try input some letters here.
This step is for testing USB port of your SWITCH.