In a message over on its official support page, the company has announced the game's online lounge feature within the Nintendo Switch Online app will be discontinued as of 28th July this year:
Players have been able to use the Online Lounge feature of the Nintendo Switch Online app to arrange Splatoon 2 online battles using their smart device, such as by sending a URL link that allows social media friends to join a room.
As of July 28, 2021, the Nintendo Switch Online app will no longer support the Online Lounge feature.
Although this feature will no longer be supported, players will still be able to voice chat with friends and use other features. Nintendo also noted how it wasn't planning on making other changes to the app at this time:
the app will continue to allow friends to voice chat, and no other changes will be made to the app at this time.
You can also continue to start a local or online multiplayer game in Splatoon 2 without use of the Online Lounge feature.
Did you ever make use of this feature? Do you even use the Nintendo Switch Online mobile app? Leave a comment down below.