Greetings. I will make this in parts and go through chronologically so it will be more understandable (hopefully).
--> Prior to the problem:
An Old 3DS XL from Australia (same as EU). Bought it in 2013 new from EB Games, only owner and user. Never opened it. Original battery still holding the...
I can't make both joycons connect at the same time on "blutooth device manager", once one is "connected" the other is only "paired". The only one showing on WiinUPro is the connected, not the paired one, either (L) or (R).