u/New-While-6140

I bought a second Switch 2 and I don't know if I should transfer my Nintendo account because I still want most if the games on my first Switch 2 and when I transfered my account from my old Switch I could no longer play them on my old Switch. Could I still play the games on my first Switch 2 if I transfer my Nintendo account or do I need to make a new one or something like that?