I have a similar problem.
I have migrated to Windows 10. Had to reinstall everything. Certainly, my user ID is now different. Moreover, I forgot my Bitbucket password, and cannot reset it, because it has been associated with an old, no more existing email address, therefore I've created a new account.
Now I'm pretty much stuck. I have several projects on my disk. Adding each as "safe" does not seem to be a reasonable solution. What else can I do?