Not sure if your answer has the right STAR format / structure. The Situation must describe the context of the disagreement (what was the issue? What was the disagreement on? Who did you disagree with?). For Task, you have to describe what you were supposed to do (your responsibility in the project). For Action, you are describing the actions you took to deal with the disagreement (e.g. decided to understand the counterparty's perspecive by doing ..., asked for a meeting with all parties involved to sync on the topic, etc). For Result, you explain what the result of your actions were and whether your actions delivered the positive outcome that you were looking for.