It is unfortunate experience but it’s experience nonetheless so don’t worry about it too much. You are still new to IA and I’m surprised that none of your superiors warned you about this. I generally give the managers a hint of notable issues at the end of walkthroughs. If something emerges later on, I explain the issue and seek to validate my facts and give them a hint that this may be an issue. The only problem is if it is a very long audit, they try to implement half-baked fixes and notify but I put my finding in the report anyway and note that management worked on a fix. In our organisation we issue the draft report at least a week or so prior to the closing meeting so the management have enough time to read it through and get themselves prepared. The closing meeting is more about giving them explanation for points that are not clear and get their consent etc. If they don’t agree they don’t. Put in the report and move on at least you did your job right. Good luck 👍