I created another account with an alternate email address in order to create this message. The problem seems to be that when I created my original account, the use of my email address as a user name was allowed (except that the number of characters allowed cut off the "m" of "com"). The username returned in the response to "forgot username" was the partial email address, which does not pass current edits. I can live with this, but it offends my desire for correctness and consistency. I will ask my original question in another post.