Tell me about a time you failed. How did you deal with the experience?
Employers ask this question to determine your ability to overcome obstacles, recover from failures and learn from your errors. It's best to use your answer to demonstrate your flexibility and share how you transformed a specific negative experience into a positive outcome
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In my first month as a BA , I had hoped to impress the stakeholders, prompting me to overpromise on a project timeline. Unfortunately, the team didn't have the resources to deliver by the promised timeline, and we lost stakeholder confidence as a result. 

Afterwards, I personally reached out to them and took full responsibility. 
Fortunately, they gave us another chance. This experience taught me to set realistic expectations and to never guarantee more than can be reasonably delivered.'