Hello,
I also have the same problem.
"To assign the Event to “Yingjie XU”, first change the person name in the “Recipient” field from "Jingjing XU" (the default Recipient) to "Yingjie XU". Second, as usual, don't forget to "Save"."
jingjing.xu / jingjing.xu is not Yingjie XU that we are having trouble.
Thank you,