Call of Duty: WWII not coming to Switch is no big surprise. Sledgehammer boss Michael Condrey said on Twitter that the decision about not supporting Switch was made by the "[Activision] business guys." The Call of Duty series has skipped Nintendo's consoles for a while now. The last installment in the shooter series to come to a Nintendo console was Call of Duty: Ghosts for the Wii U, back in 2013.
Call of Duty: WWII launches in November, but you may not need to wait that long to play, as a multiplayer beta is coming up this summer. Source: https://www.gamespot.com