https://www.gamespot.com/articles/nintendo-switchs-dark-souls-remastered-network-tes/1100-6461893/

Bandai Namco has announced the network test for Dark Souls Remastered on Nintendo Switch will start later today, September 21. You'll need a Switch Online subscription if you want to participate.

According to Siliconera, the network test will be available for players in both North and South America, Japan, and Europe. If you decide to take part, you'll be able to play through Dark Souls' Undead Parish. The Undead Parish is one of the earliest areas you'll be able to visit in Dark Souls. It's the location where the game's environment really begins to open up, and also the place where many Dark Souls players encountered their first major challenges: online invaders and the Bell Gargoyle boss fight. The network test isn't only a good way for you to test Nintendo's Dark Souls Remastered servers, it's also a good opportunity to see if Dark Souls is the type of game you want to play.