M.M. O'Keefe, The problem is that the new “subdomain” profile web structure doesn’t map with the earlier “subdirectory” profile in the search engines. Check it in DuckDuckGo, and other search engines.
In your old profile name was “MM_OKeefe” and the new one is “mm-okeefe”, the “underscore” becomes “hyphen”.
You may ask the Medium helpdesk that you want to go back to the old profile name. There should be a “come back” option.
Thanks for your valuable time and the question/comment.