When working with product or project managers, have you disagreed with task prioritization? How did you resolve this?

This is a common situation for every engineering manager. We usually encounter such scenarios where we do not agree with the prioritization of tasks. In such cases, I raise my question and ask them to put some light on that particular task. After knowing their reason for giving that priority to the task, I got okay when their reasons looks genuine to me. If not, I stick to my words until I got satisfying answers from all the key stakeholders.