When applying the Email Password Behavior, did you go to the Email Settings tab to set the body of the email? you will need to set the email message to use the columns from your user table, the default email message will use the default user table column names.
also, on the email server settings tab, you will need to select a character set.
I have logged a bug in regards to the error on reinspecting the behavior.
Yes I set the email body using my own table
I've set the UTF-8 character set.