Not able to findElement with Id(Even in Appium Inspector)

My developer has generated apk file using When the element with Id locator is converted, it does not have packageName appended in prefix with element Name
Issue: When I am trying to read the element through automation or UI-Inspector, element with id locator is not giving any result. Please help.
Note: I even tried to add the packageName and android in the prefix but still no help.
both didn’t work.**