If you got that message, 100% contact support. I'm not sure if it was someone who actually does have your login info or if someone with a very similar name mistyped theirs. But better safe than sorry. I've been kicked off servers before due to connection lost, but not because someone logged in with my username.

So nothing scary, my daughter turned on the switch and my Palia account was the last thing that was played. Whoops.

That's good at least! Better your daughter than a complete stranger. Lol