People really don't have any passion for talking about your solution because they don't really care about you and you should take any discussion of solutions with a large grain of salt because customers are not PMs.

But people are passionate about talking about their problems and that's where you should orient your discussions on. Don't ask about your product at all during PM interviews, simply try to understand the problems users are facing and figure out what ways your product is or is not addressing those problems.

The biggest mistake I see PMs make is coming in with an over optimism bias and assuming that your product must be top of mind for all users when the reality is that the most often scenario you discover from user interviews is that the problem you're trying to solve is of relatively minor importance to most people.