Clarify the agreement that existed
Identify the promise, policy, schedule, ownership, or shared understanding that applies before assigning blame. For a message about how to apologize for copying the wrong people on email, use this factual base: state what went wrong, which task or person was affected, and what is already known about the impact.
Resolve the next dependency
State what is complete, what remains disputed, and which action would move the situation forward. Correct the error, name the owner of each next step, and provide a dependable update time. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Document without threatening
Do not blame workload, hide material risk, or promise a deadline you cannot meet. Use the required manager, HR, security, or compliance route when confidential data or employee safety is involved. Keep a factual record and describe only remedies you are entitled and prepared to use.