First, DO NOT push the blame away. Read our past blog on how to deal with failure here. You have to be clear with the interviewer when you reveal your past failure(s). You have to show that you understand your failure and the lesson learned from it for the future.
Next, summarize the important details on how you went about planning the product. Decisions you’ve made and how you dealt with complications. Emphasize that you understood where you failed and why the product resulted in a failure. Overall, show the interviewer that you fully understood the situation and know where the flaws lie. Through this, the interviewer can see the scope of your abilities and judge how your skills would fit in their company.
Finally, it isn’t the end of your career once they’ve seen you failed. Everybody has moments where they failed and didn’t fulfill expectations. The interviewer won’t just look at one piece of your work history. So always show your confidence and don’t be afraid to mention your mistakes as long as you’ve learned from them.