Start with the part that is verifiable
Separate the event you can describe from the motive or reaction you are guessing. For a message about how to follow up for final project acceptance, use this factual base: summarize the deliverable, version, requested input, owner, and effect on the schedule.
Make one answerable request
Give the recipient one concrete question or next step instead of several emotional jobs at once. Give a small set of options and explain which default plan applies if the real deadline passes. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Leave the recipient in control
Do not bury a scope or price change, threaten the relationship, or pretend silence means approval. Use the contract and documented escalation route for legal, payment, privacy, or security decisions. A clear message remains useful even when the answer is no or no answer arrives.