I changed my User Mii and now I can't connect to the server

So, I changed my User Mii with one I recently created, and then when I went to play Splatoon online, it said I can’t connect to the server, so I did a connection test, and it said that everything is fine, so I went to my friend list, and I got the same error. What can I do?

can you give us a error code?

What kind of error you are like getting? Unless you need to restart the console for you to play Splatoon Online since that frequently happens to most people when they are on a certain game.

We need an error code before we can give assistance.

Yesterday, the BOSS server did go down for a short time temporarily (which is needed for Splatoon) so it might have been that.

But we need an error code.