The issues have been fixed and you can now log in the game with Twitter again. Thank you for your understanding and support!
#Arknights #Yostar
Arknights_EN: Dear Doctor,
Due to issues from Twitter, the Twitter login function is currently having problems. Please remain patient until this issue is fixed. Thank you for your understanding.
#Arknights #Yostar

https://twitter.com/ArknightsEN/status/1427566219566059520