I tried to trade with someone from Scarlet to Violet. I was attempting to trade locally because I don't have a NSO membership. But the trade never ended up working. Was this because I was using a Lite and trying to trade with a switch?
The Switch Lite consoles are able to trade with normal Switch consoles.
Ensure both switches are on local communication, and that the code was correct. You can also try the good old turn it off and back on again method.