I don't think you can change the userID in TT ... did you try in QB ?
How do I update my TurboTax account information?
To update your TurboTax Advantage account, see these instructions.
To update your TurboTax (non-Advantage) account email, phone number, mailing address, or password:
- Sign in to TurboTax and select Intuit Account on the left, just above "Sign Out" (you may need to scroll down; click or tap the 3 white lines or Tax Home if you still don't see this).
- This will open your Account.
- Select Edit next to the information you want to change.
