Okay, this might get a bit convoluted, but there may be a way to sort this out. Bear with me. You have access to your Battle.net account now, correct? I’m assuming that’s how you’re logging in for Bungie. I don’t see an Xbox account on your profile, which may be the saving grace here. Create a throwaway account for Xbox/MS, using a junk gmail account or some such. In your Bungie profile, link the throwaway Xbox account. Logout of Bungie, and then login again, but using the throwaway Xbox account. You should then be able to unlink your Battle.net account. Create a brand new Bungie account, and link your Battle.net account to it. You are now free of the hacker, and can link your Steam account for migration. Edit- well crud... I missed that you mentioned cross-save is active on your profile. The above idea will not work then, as I believe you’d need to authenticate the two bs accounts. You might try your luck with sending in one of the newly created forms Bungie has, that allows you to directly appeal to Bungie staff for help with cross-save issues. https://www.bungie.net/en/Help/Troubleshoot?oid=48099