IInspectable's answer (which is right):

By default, the control ID is exposed as the AutomationId property (UIA_AutomationIdPropertyId). You can run the Inspect.exe tool to verify this. For example, the edit control with the "User ID" label should have an AutomationId that matches the numeric value of IDC_USERNAME. Inspect is labeled as a "legacy tool" which conventionally translates to: "The last version of the tool that actually works." Accessibility Insights is entirely useless garbage.