From the situation to a useful next step.
Here is a possible starting point. In a conversation, we can clarify the circumstances and agree my involvement.
Your selected situation
The client said yes. Now agree what that means.
Where we could start
I would establish what was offered to the client and what scope the team understands. I would identify differences that need agreeing before another commitment is made.
What you would have
A comparison of the proposal and expected scope, with decisions still needed.
Who needs to be involved
The account owner, client and a delivery team representative.
Roles and decisions
The team provides estimates; authorised parties approve commercial terms.
Prepare an enquiry
This is an editable starting outline, not a submitted enquiry. Add your own circumstances.