YOU SAID:
fillIn('[test-id="fldAddMfaTarget"]', '(123)123-1234');
INTO JAPANESE
fillIn ('[テスト id ="fldAddMfaTarget"]'、'(123)123-1234');
BACK INTO ENGLISH
fillIn (' [test id = "fldAddMfaTarget"] ',' (123) 123-1234 ');
INTO JAPANESE
fillIn (' [テスト id ="fldAddMfaTarget"] '、' (123) 123-1234 ');
BACK INTO ENGLISH
fillIn (' [test id = "fldAddMfaTarget"] ',' (123) 123-1234 ');
You've done this before, haven't you.