Thanks, this was the solution for me, from @AnnetteB6. https://ttlc.intuit.com/community/taxes/discussion/re-why-is-turbo-tax-limiting-my-itemized-deductio...
The way the prompt is phrased is misleading, suggesting the loan would be secured by "another" property if checking Yes: "Yes this loan is secured by a property of mine".
TurboTax defaulted to the response "No, my loan isn't secured", which seems like the least common response. My 1098 has box 7 unchecked but my address in box 8. I wonder if TurboTax selects No by default if box 7 is unchecked on form 1098.
