Long story short ...

1.) I enrolled in Trailhead with my LinkedIn account and added my work E-mail/Username as a User in a Dev org (Standard role, not System Admin).
2.) I now need to free my work E-mail/Username to associate it elsewhere.
3.) I cannot log in to the my Dev org from my LinkedIn account, and because I did the module on setting up a subdomain and it prevents "Launch" from working in Trailhead.
4.) As such, I cannot remove my work E-mail/Username, I cannot delete my dev org, and of course, I cannot get a reply from support.

Any help would be GREATLY appreciated. Thank you.