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 speaking out of turn, use this factual base: name the exact action, the inconvenience it caused, and what you understand now.
Resolve the next dependency
State what is complete, what remains disputed, and which action would move the situation forward. Offer the smallest useful repair and give a realistic time for completing it. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Document without threatening
Do not inflate the apology, fish for reassurance, or demand immediate forgiveness. If the person has asked for no contact, repair what you can without sending another message. Keep a factual record and describe only remedies you are entitled and prepared to use.