Strong answer
Recover trust by separating contract scope, launch value, and phase-two discovery.
- Acknowledge the expectation gap without debating blame in front of the customer.
- Confirm what is in scope, what can be validated this week, and what must move to phase two.
- Offer a limited discovery path only if it protects first value and has customer-owned data dependencies.
- Create an internal handoff correction so Sales, CS, and Implementation agree on the next message.
- Send the sponsor a launch plan that preserves a credible first-value milestone.