My username appears to be fcc2f08cddd-bdcc-4141-8c7b-bbfa5a57ceea on FCC. I also cannot seem to sign in with my e-mail address or username (techguru). Just wondering if there’s a problem with my account; I don’t want to lose my progress! 
I can’t find a profile page for “techguru”. Is it possible that you created the account on the beta version of the site?