Pretty much what it says on the tin, just done a reinstal to make sure it wasn't an issue there, auto-login kicks in, says the login was successful and then... does nothing but sit there on the login screen.
Same here. I 've uninstalled Chitu Pro for resintalling it, and nothing changed. It says I'm logged in successfully, but the button says "switch account" and nothing is launched...
This suggests that there may be an issue with the device's login settings or with the auto-login feature itself. Hope the splatoon 3 game will bring you the most wonderful experiences!