When you failed to meet a deadline

S - Early in my career as PM for Precision workstations at Dell, I led launch of BIOS security feature called chassis intrusion where the system would not allow booting OS if it detects an open chassis. 
Failure - I missed a critical use case linked with adjacent feature when distributor customers flash custom BIOS via BIOS recovery option. This caused systems to lock out during OS boot, putting 100M+ contracts at risk. 

- **Action** – I immediately owned the issue, informed sales and customers, explained the root cause, and disabled the feature in the launch. I reprioritized the roadmap by pausing another BIOS feature so we could fix this gap quickly.
    
- **Learning & Fix** – I realized I hadn’t tested enough edge cases. I expanded test criteria to cover adjacent scenarios and updated smoke tests to include security impact checks.
    
- **Result/Reflection** – The launch recovered, but more importantly, the changes I implemented have stayed with me. In my current Principal PM role, I apply the same rigor to prevent similar failures when shipping complex commerce capabilities.