1. Log into https://myaccount.microsoft.com on another computer or phone
  2. Click/tap on "Manage devices"


  3. Click/tap on the name of the locked device




  4. Click/tap on the "View BitLocker Keys" button


  5. Look for the Key ID that matches the one shown on the locked computer
  6. Click/tap on the "Show recovery key" button under the correct Key ID


  7. Enter the shown recovery key on the locked computer
  8. The BitLocker prompt screen on the locked computer can time out after an hour or so, so if the recovery key doesn't immediately work, restart the locked computer and try again.