Mario Kart 8 local 2-player doesn't support JoyCon Grip

Mario Kart 8 players on Switch have to use one JoyCon a piece in local split-screen mode--the JoyCon Grip isn't supported.

Nintendo Switch™ Mario Kart™ 8 Deluxe Bundle (Full Game Download + 3 Mo. Nintendo Switch Online Membership Included) with Mazepoly Accessories

Nintendo Switch Mario Kart 8 Neon Multiplayer Racing Bundle: Red Blue JoyCon Console, Mario Kart 8 Deluxe & Online Membership, Mytrix Wheels & Grips 4

Vivid 7” OLED screen Local co-op, online, and local wireless multiplayer 64 GB internal storage (a portion of which is reserved for use by the system)

Nintendo Switch – OLED Model w/ Neon Red & Neon Blue Joy-Con

Joycon Grip

Mooroer Joycon Grip Compatible with Nintendo Switch & Switch OLED Model Controller Grip and Switch Steering Wheel for Mario Kart 8 Deluxe 3 PCS[Black]

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Nintendo Switch's bundled Joy-Con grip doesn't charge controllers (charging grip sold separately) : r/Games

8bitdo's NES30 Pro controller is an almost perfect Nintendo Switch companion - The Verge