The Nintendo Switch Online app is currently only accessible via smart devices, but someone has come up with a solution to access it on PC!
We’ve no idea how many people would need a solution like this (we can imagine the small minority of people who do not own a smartphone, or simply do not want to download the app on it), however it sounds like a great idea for those that need it.
The only limitation of the Nintendo Switch Online application on PC is it doesn’t support voice chat. Other services, such as matchmaking and SplatNet 2, work perfectly fine. You’ll have to login to your Nintendo Account to access these services.
For details on installation, check out this website.