How do you prove to a PM that a found bug is critical if they disagree?

To convince the PM of the criticality of a bug, it is important to present objective data and demonstrate the impact of the issue on business and users. You can:

• Demonstrate the bug with a live example to show how it manifests.
• Describe which functions or processes are disrupted due to the bug.
• Show how the bug affects the user experience or could lead to customer loss.
• Provide examples from metrics (e.g., drop in conversion, increase in failures).
• Compare with the criticality criteria adopted in the project.

If the PM still disagrees, you can suggest conducting testing with real users or gathering feedback to support your position with facts.