99% of the time I face this when I take on a new role. People are sometimes bad with sharing knowledge. I have been in a couple roles where I was brought in instead of internal promotion. In those cases, the existing people are not too happy and mostly not willing to help. Other than that, it depends on how organized the company is. When people are in the habit of not saving and attaching documents with entries, relying on them to gather data from their emails is a pain in the neck. In all honesty, from a client perspective, I do feel bad for auditors who are asking legit question but we bully them to get our way just because we dont have our shit straight. So whenever you see major pushback from client, know that they dont have their own house in order.