In this paper, we present how we used generative AI (GenAI) as a pedagogical tool for students taking a course in tangible interaction design. In this course, the students design different physical-digital objects (PDOs) to learn designing, sketching and prototyping with code and hardware. However, due to the short course duration these PDOs are not evaluated or explored with any kind of field or user study. Therefore we gave the students the exercise of doing user interviews with GenAI to explore their design ideas further. With this paper, we contribute a description and the outcomes of this approach, and highlight the pedagogical implications for student learning.