You need a paid membership to Nintendo Switch Online to play

You'll have to pay for Nintendo Switch's online play, but they're getting rid of region locking

With a Nintendo Switch Online membership, you'll get access to online play in compatible games, an ever-growing catalog of classic NES™, Super NES™

Nintendo Switch Online 3-Month Individual Membership (Digital)

Nintendo Switch Online's N64 and Sega Genesis 'expansion pack' launches October 25th for $49.99 per year - The Verge

Level up with a Nintendo Switch Online Membership - Nintendo Official Site

Nintendo Switch Online Membership Pricing And More Details Revealed - GameSpot

What you need to know about the new Nintendo Switch Online + Expansion Pack membership plan. - News - Nintendo Official Site

Level up with a Nintendo Switch Online Membership - Nintendo Official Site

Nintendo Switch Online 12-Month Individual Membership [Digital Code] : Everything Else

Nintendo Switch Online - Nintendo - Official Site

The best games on Nintendo Switch Online

Nintendo Switch will have a paid online service starting this fall - Polygon

Fortnite for Switch won't require Nintendo's premium online service for play - Polygon

Get Ready To Pay For Nintendo Switch Online Play