When you subscribe to Intuit services using a single email address, the system will create one user ID for all logins. The only way to unlink your services is to use another email address that is different from the credential you used when you subscribe to us.
For the instructions on how to change your email for both services, see the following links:
Separating Quickbooks account from Turbo Tax Account
I have already done that. The problem is when I log into my Quickbooks work account, even though I have created a separate account with a different email and user ID - I can still access my personal Turbo Tax when logging into my work account. Turbo Tax is still linked.