One of our last few sprints we had a lot of “Secret requirements” pop up on some of our backlog items and it was difficult to get to “Done” because the PO kept finding things that didn’t meet their expectations.

If your PO is there, and you agree on what it is you’re doing, how do you really have that conversation of “Well that may be a requirement but this is what we agreed on committing to, and what you’re saying is -something else-”