How to fix Genshin Impact Facebook login error

On April 30, 2021, Genshin Impact players encountered an issue logging into the game via Facebook. The publishers of the game are already solving this problem and advise the following.

Try to enter the game using the in-game login, namely the username (Not the player's name), as well as the associated mailbox. If nothing works, then just wait for a solution to the problem.

Once everything is up and running, please link additional login methods to your account. —> https://account.mihoyo.com/