How did you create a custom entry to send-key for "t" and "y". I have Y and y in my password and cant login. When I type y and t in username field if trying to reset password they both work so what makes you believe that they are not working? Not doubting your comment, just trying to figure out if my issue is same as I cannot login. When I type my password it goes back to login screen and if I try and reset my password by using my AppleID it doesnt allow my to change it. Both computer password and AppleID password have "y" in them.
I'm also having issues with "1" and "2".