Your question is Post-Mortem a Lost Strategic Deal. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You were pursuing a major strategic account and ultimately lost the deal. After the loss, you need to understand what happened, separate controllable mistakes from external factors, and turn the outcome into a better operating playbook for future opportunities.
Describe a time you lost a major deal. What was the post-mortem, and what would you do differently today?