hotrod - OFF TOPIC, but here: your existing (old) links without www. or SSL will simply be rewritten ... eventually google and other search engines will update your links even if you don't update your sitemap (if the change is temporary no harm done, especially if you keep the code as I provided without 301)... you might want to clear your cache and make sure your SEF links are all correct too before updating and submitting your sitemap ... the end result will give you more consistent links going forward - and better rankings too (I use Artio JoomSEF - do you use a program?). Hope that helps.
Yes, I'm curious to see if forcing
https://www. will stop the duplicates for you.
Restore the default htaccess or remove any custom htaccess that might undo the code I provided (use # at the beginning of a line to comment) - attached is a copy of my htaccess (rename it remove the ending .txt).
[attachment cleanup by admin]