Nintendo confirmed up to 23 titles (1st party/3rd party) are million seller on the Switch!
Below is pulled from wikipedia, its probably accurate, at least they provide links. please update to include other 2 title dear Mr. Mod. Thanks for the hard work.
Congratulations to Mario + Rabbits for being the highest 3rd party games on switch with around 2m as of end 2018. ACTUALLY THAT IS TERRIBLE, SHEEPS PLEASE SUPPORT 3RD PARTY. Dont just port beg but then don't buy, you guys are terrible customers. Heh port begged Persona 5 to hell but in the end nobody will buy, glad Atlus never cared.