You can only link one QBSE account, and it should have the same credentials to the TurboTax account. Therefore, only use the one with the same credentials and make sure you declared that you're filing jointly before forwarding the data to TurboTax.
From the Gear icon, select Tax profile.
Select Married for the Marital status and Yes for Filing jointly.
Under Tax profile, enter your Spouse's first name, last name, annual W2 income, and federal withholding.
Scroll down and proceed with the Deduction and other required information.