Temporary Measures Regarding Login Issue on Steam

Enter into the Endless Possibility!
Hello, Admirals.
We apologize for the inconvenience caused by the authentication error on Steam.
We have confirmed that error was caused to certain Admirals who are using the old certificate (C2) due to a change to the new certificate (G2).
We'd like to inform you of temporary measures to fix the issue.
If the error is not fixed through the steps below, please contact Support.
Please see below for more details.
ENG : https://uwo.floor.line.games/us/bbsCmn/detail/1731063703630014456
JPN : https://uwo.floor.line.games/jp/bbsCmn/detail/1731063556940012319
CHT : https://uwo.floor.line.games/tw/bbsCmn/detail/1731063827828020850