ウルトラソウルズでseed値探しやってみました。
このメッセージは、レアチケ10連の結果がありふれてるってことなのでしょうか。
それか、サイトが混んでいるのでしょうか。
数時間後にまたやってみようとは思いますが…

・Unfortunately we didn't successfully find your seed. There could have several possible reasons:
The first rare cat you put into is a duplicated rare cat. Try to remove it from the list and try again.
There's a bug.
You put the cats wrong, or you picked the wrong event.
The formula changed and we didn't update the code yet.
Do you want to try again?