You must indicate that "I am not required to pay the past due amount" and that you are filing a joint return with your spouse. Plus, an additional qualification shown on that screen to indicate the type of debt that your refund would be used to pay must be checked. Otherwise, you will see a message that you are not qualified to file the Injured Spouse form.
In other words, you are an injured spouse because of your spouse's debt which has nothing to do with you. You are not required to pay the debt.
Take a look at the following TurboTax article for more details: How do I file Form 8379, Injured Spouse Allocation?
@russsherry2006
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